Dennis Desjardin | San Francisco State University (original) (raw)

Papers by Dennis Desjardin

Research paper thumbnail of The genus Inocybe (Inocybaceae, Agaricales, Basidiomycota) in Thailand and Malaysia

Phytotaxa, Oct 13, 2015

Twenty-five species of Inocybaceae are reported from Thailand and Malaysia. Thirteen are describe... more Twenty-five species of Inocybaceae are reported from Thailand and Malaysia. Thirteen are described as new from four different major clades of the family: I. errata from the Mallocybe clade, I. bicolorata and I. proxima from the Inosperma clade, I. neglecta from the Pseudosperma clade, and I. brevisquamulosa, I. fragilissima, I. latibulosa, I. lineata, I. ornata, I. parvibulbosa, I. pileosulcata, I stellata and I. thailandica from Inocybe sensu stricto. Nineteen species are documented in full, circumscribed by morphological and molecular (ITS and nLSU sequences) features. Six additional lineages are depicted in a molecular phylogenetic context but at present lack sufficient morphological data for complete description. Illustrations of anatomical features, photographs of basidiomes, and SEM images of basidiospores are presented. A key to 19 species of Inocybaceae from Thailand and Malaysia is provided.

Research paper thumbnail of A new halotolerant species of Physalacria from Hong Kong

Mycologia, Jul 1, 1999

Physalacria maipoensis (Basidiomycetes, Agaricales, Tricholomataceae) is described as a new halot... more Physalacria maipoensis (Basidiomycetes, Agaricales, Tricholomataceae) is described as a new halotolerant species from a mangrove forest in Hong Kong. A description, illustrations and comparison with phenetically similar taxa are provided.

Research paper thumbnail of Four new species of Psilocybe from Malaysia and Thailand, with a key to the species of sect. Neocaledonicae and discussion on the distribution of the tropical and temperate species

Research paper thumbnail of A new species of Hemimycena (Agaricales, Tricholomataceae) from Anza Borrego Desert of southern California

Research paper thumbnail of Agaricales of the Hawaiian Islands. 2. Notes on Some <i>Entoloma</i> Species

Mycologia, May 1, 1993

Four new species of Entoloma are described from material collected from the island of Hawaii: E. ... more Four new species of Entoloma are described from material collected from the island of Hawaii: E. nanosordidum, E. fragilissimum, E. purum, and E. kipukae. Entoloma stylophorum is reported for the first time from the Central Pacific. All new species are illustrated and compared with allied taxa.

Research paper thumbnail of Studies on Marasmius from Eastern North America. III. Marasmius Brevipes and Micromphale Sect. Rhizomorphigena

Mycologia, 1989

Micromphale westii, the type species of Micromphale sect. Rhizomorphigena, is considered a synony... more Micromphale westii, the type species of Micromphale sect. Rhizomorphigena, is considered a synonym of Marasmius brevipes. Micromphale sect. Rhizomorphigena is reevaluated utilizing pileipellis and stipe tissue morphology and transferred to Marasmius, where it is allied with sect. Androsacei. Micromphale is redefined and considered to comprise two sections, Micromphale and Perforantia. Type specimens of two previously linked species were reexamined. Marasmius porphyreticus is placed in sect. Rhizomorphigena. Arrhenia goossensiae is redescribed, and Marasmiellus usambarensis, from Tanzania, is described as a new species. All taxa are illustrated and compared with phenetically similar taxa.

Research paper thumbnail of Studies onMarasmiusfrom Eastern North America. IV. Additions to Sect.Sicci

Mycologia, 1991

Three new taxa belonging in Marasmius sect. Sicci are described from material collected from sout... more Three new taxa belonging in Marasmius sect. Sicci are described from material collected from southeastern North America: M. pseudobambusinus, M. floridanus var. virginianus, and M. haematocephalus var. anomaloides. Marasmius floridanus var. floridanus is redescribed and M. spadiceus is considered a synonym. M. haematocephalus var. haematocephalus is reported from the southern Appalachian Mountains. All taxa are illustrated and compared with phenetically similar taxa.

Research paper thumbnail of Clitopilus chalybescens, a new species from Thailand

Research paper thumbnail of Mycena Lacrimans, a Rare Species from Amazonia, is Bioluminescent

Edinburgh Journal of Botany, Nov 15, 2007

Mycena lacrimans (Agaricales, Mycenaceae) is redescribed from material collected recently near th... more Mycena lacrimans (Agaricales, Mycenaceae) is redescribed from material collected recently near the type locality and is for the first time reported as bioluminescent. A comprehensive description, illustrations, photographs, comparison with phenetically similar species, and discussion of phylogenetic relationships are provided.

Research paper thumbnail of A New Species of Melanotus from the Southern Appalachian Mountains

Mycologia, Jul 1, 1990

Melanotus defraudatus Horak, Desjardin et Petersen sp. nov. FIGs. 1-7 Pileus-4.5 mm latus, convex... more Melanotus defraudatus Horak, Desjardin et Petersen sp. nov. FIGs. 1-7 Pileus-4.5 mm latus, convexus vel campanulatus, excentrice conchiformis, pallide argillaceus, siccus. Lamellae adnatae, pileo concolores, acie alba vel subconcolori instructae. Stipes-3.0 x-1.0 mm, excentricus, cylindraceus, pileo concolor, pruinosus. Odor saporque nulli. Sporae 5-6(-6.5) x 3-4 ~tm, ovoideae vel subellipticae, pallidae, tenuitunicatae, !eves, poro distincto instructae. Basidia 4-sporigera. Cheilocystidia I 0-20 x 3-5 ~tm, fusoidea, inconspicua. Fibulae praesentes. Ad detritum putridum Caricis in loco paludoso, Blue Valley, Macon Co., North Carolina, United States. HOLOTYPUS: Petersen no. 2230 (TENN 48119).

Research paper thumbnail of Studies in marasmioid fungi: VII. Marasmius anisocystidiatus, new species in section Sicci

Research paper thumbnail of The Genus Marasmius from the Southern Appalachian Mountains

Research paper thumbnail of Two remarkable taxa of Crepidotus from Bonin Islands (Japan) and new records from the Hawaiian Islands and Papua New Guinea

Research paper thumbnail of New species and new records of Marasmius from Panamá

Nine species of Marasmius from Barro Colorado Island, Panamá are treated. Three species, Marasimi... more Nine species of Marasmius from Barro Colorado Island, Panamá are treated. Three species, Marasimius griseoradiatus, M. scopulatus and M. variabilis are described as new. Six other species, Marasmius helvolus, M. multiceps, M. praecox, M. tageticolor, M. tenuisetulosus and M. leveilleanus are reported from Panamá for the first time. Descriptions and microscopic illustrations are provided for all but M. leveilleanus; photographs are provided for all taxa.

Research paper thumbnail of First Report of <i>Marasmiellus mesosporus</i> Causing Marasmiellus Blight on Seashore Paspalum

Plant Disease, Nov 1, 2010

Research paper thumbnail of Spongiforma squarepantsii, a new species of gasteroid bolete from Borneo

Mycologia, Sep 1, 2011

A gasteroid bolete collected recently in Sarawak on the island of Borneo is described as the new ... more A gasteroid bolete collected recently in Sarawak on the island of Borneo is described as the new species Spongiforma squarepantsii. A comprehensive description, illustrations, phylogenetic placement and a comparison with a closely allied species are provided.

Research paper thumbnail of PHYLOGENETIC PLACEMENT OF AN UNUSUAL CORAL MUSHROOM CHALLENGES THE CLASSIC HYPOTHESIS OF STRICT COEVOLUTION IN THE<i>APTEROSTIGMA PILOSUM</i>GROUP ANT-FUNGUS MUTUALISM

Evolution, Aug 1, 2009

The ∼50 million-year-old fungus-farming ant mutualism is a classic example of coevolution, involv... more The ∼50 million-year-old fungus-farming ant mutualism is a classic example of coevolution, involving ants that subsist on asexual, fungal biomass, in turn propagating the fungus clonally through nest-to-nest transmission. Most mutualistic ants cultivate two closely related groups of gilled mushrooms, whereas one small group of ants in the genus Apterostigma cultivates a distantly related lineage comprised of the G2 and G4 groups. The G2 and G4 fungi were previously shown to form a monophyletic group sister to the thread-like coral mushroom family Pterulaceae. Here, we identify an enigmatic coral mushroom that produces both fertile and sterile fruiting structures as the closest free-living relative of the G4 fungi, challenging the monophyly of the Apterostigmacultivated fungi for the first time. Both nonparametric bootstrap and Bayesian posterior probability support the node leading to the G4 cultivars and a free-living Pterula mushroom. These data suggest three scenarios that contradict the hypothesis of strict coevolution: (1) multiple domestications, (2) escape from domestication, (3) selection of single cultivar lineages from an ancestral mixed-fungus garden. These results illustrate how incomplete phylogenies for coevolved symbionts impede our understanding of the patterns and processes of coevolution.

Research paper thumbnail of Out of the Palaeotropics? Historical biogeography and diversification of the cosmopolitan ectomycorrhizal mushroom family Inocybaceae

Journal of Biogeography, Apr 1, 2009

Aim The ectomycorrhizal (ECM) mushroom family Inocybaceae is widespread in north temperate region... more Aim The ectomycorrhizal (ECM) mushroom family Inocybaceae is widespread in north temperate regions, but more than 150 species are encountered in the tropics and the Southern Hemisphere. The relative roles of recent and ancient biogeographical processes, relationships with plant hosts, and the timing of divergences that have shaped the current geographic distribution of the family are investigated.

Research paper thumbnail of A Unique Ballistosporic Hypogeous Sequestrate Lactarius from California

Mycologia, 2003

Lactarius rubriviridis sp. nov., characterized by hypogeous, sequestrate basidiomes with red late... more Lactarius rubriviridis sp. nov., characterized by hypogeous, sequestrate basidiomes with red latex, green stains, and forcibly discharged, reticulate basidiospores is described and illustrated. During the Spring, the new species forms basidiomes associated with conifers at 1400-1800 m elevation in the Sierra Nevada, and is known from two specimens collected 19 yr apart. Comparisons with the putatively polyphyletic genera Arcangeliella and Zelleromyces, and an accounting of all known members of these genera are provided.

Research paper thumbnail of A unique ballistosporic hypogeous sequestrate<i>Lactarius</i>from California

Mycologia, 2003

Lactarius rubriviridis sp. nov., characterized by hypogeous, sequestrate basidiomes with red late... more Lactarius rubriviridis sp. nov., characterized by hypogeous, sequestrate basidiomes with red latex, green stains, and forcibly discharged, reticulate basidiospores is described and illustrated. During the Spring, the new species forms basidiomes associated with conifers at 1400-1800 m elevation in the Sierra Nevada, and is known from two specimens collected 19 yr apart. Comparisons with the putatively polyphyletic genera Arcangeliella and Zelleromyces, and an accounting of all known members of these genera are provided.

Research paper thumbnail of The genus Inocybe (Inocybaceae, Agaricales, Basidiomycota) in Thailand and Malaysia

Phytotaxa, Oct 13, 2015

Twenty-five species of Inocybaceae are reported from Thailand and Malaysia. Thirteen are describe... more Twenty-five species of Inocybaceae are reported from Thailand and Malaysia. Thirteen are described as new from four different major clades of the family: I. errata from the Mallocybe clade, I. bicolorata and I. proxima from the Inosperma clade, I. neglecta from the Pseudosperma clade, and I. brevisquamulosa, I. fragilissima, I. latibulosa, I. lineata, I. ornata, I. parvibulbosa, I. pileosulcata, I stellata and I. thailandica from Inocybe sensu stricto. Nineteen species are documented in full, circumscribed by morphological and molecular (ITS and nLSU sequences) features. Six additional lineages are depicted in a molecular phylogenetic context but at present lack sufficient morphological data for complete description. Illustrations of anatomical features, photographs of basidiomes, and SEM images of basidiospores are presented. A key to 19 species of Inocybaceae from Thailand and Malaysia is provided.

Research paper thumbnail of A new halotolerant species of Physalacria from Hong Kong

Mycologia, Jul 1, 1999

Physalacria maipoensis (Basidiomycetes, Agaricales, Tricholomataceae) is described as a new halot... more Physalacria maipoensis (Basidiomycetes, Agaricales, Tricholomataceae) is described as a new halotolerant species from a mangrove forest in Hong Kong. A description, illustrations and comparison with phenetically similar taxa are provided.

Research paper thumbnail of Four new species of Psilocybe from Malaysia and Thailand, with a key to the species of sect. Neocaledonicae and discussion on the distribution of the tropical and temperate species

Research paper thumbnail of A new species of Hemimycena (Agaricales, Tricholomataceae) from Anza Borrego Desert of southern California

Research paper thumbnail of Agaricales of the Hawaiian Islands. 2. Notes on Some <i>Entoloma</i> Species

Mycologia, May 1, 1993

Four new species of Entoloma are described from material collected from the island of Hawaii: E. ... more Four new species of Entoloma are described from material collected from the island of Hawaii: E. nanosordidum, E. fragilissimum, E. purum, and E. kipukae. Entoloma stylophorum is reported for the first time from the Central Pacific. All new species are illustrated and compared with allied taxa.

Research paper thumbnail of Studies on Marasmius from Eastern North America. III. Marasmius Brevipes and Micromphale Sect. Rhizomorphigena

Mycologia, 1989

Micromphale westii, the type species of Micromphale sect. Rhizomorphigena, is considered a synony... more Micromphale westii, the type species of Micromphale sect. Rhizomorphigena, is considered a synonym of Marasmius brevipes. Micromphale sect. Rhizomorphigena is reevaluated utilizing pileipellis and stipe tissue morphology and transferred to Marasmius, where it is allied with sect. Androsacei. Micromphale is redefined and considered to comprise two sections, Micromphale and Perforantia. Type specimens of two previously linked species were reexamined. Marasmius porphyreticus is placed in sect. Rhizomorphigena. Arrhenia goossensiae is redescribed, and Marasmiellus usambarensis, from Tanzania, is described as a new species. All taxa are illustrated and compared with phenetically similar taxa.

Research paper thumbnail of Studies onMarasmiusfrom Eastern North America. IV. Additions to Sect.Sicci

Mycologia, 1991

Three new taxa belonging in Marasmius sect. Sicci are described from material collected from sout... more Three new taxa belonging in Marasmius sect. Sicci are described from material collected from southeastern North America: M. pseudobambusinus, M. floridanus var. virginianus, and M. haematocephalus var. anomaloides. Marasmius floridanus var. floridanus is redescribed and M. spadiceus is considered a synonym. M. haematocephalus var. haematocephalus is reported from the southern Appalachian Mountains. All taxa are illustrated and compared with phenetically similar taxa.

Research paper thumbnail of Clitopilus chalybescens, a new species from Thailand

Research paper thumbnail of Mycena Lacrimans, a Rare Species from Amazonia, is Bioluminescent

Edinburgh Journal of Botany, Nov 15, 2007

Mycena lacrimans (Agaricales, Mycenaceae) is redescribed from material collected recently near th... more Mycena lacrimans (Agaricales, Mycenaceae) is redescribed from material collected recently near the type locality and is for the first time reported as bioluminescent. A comprehensive description, illustrations, photographs, comparison with phenetically similar species, and discussion of phylogenetic relationships are provided.

Research paper thumbnail of A New Species of Melanotus from the Southern Appalachian Mountains

Mycologia, Jul 1, 1990

Melanotus defraudatus Horak, Desjardin et Petersen sp. nov. FIGs. 1-7 Pileus-4.5 mm latus, convex... more Melanotus defraudatus Horak, Desjardin et Petersen sp. nov. FIGs. 1-7 Pileus-4.5 mm latus, convexus vel campanulatus, excentrice conchiformis, pallide argillaceus, siccus. Lamellae adnatae, pileo concolores, acie alba vel subconcolori instructae. Stipes-3.0 x-1.0 mm, excentricus, cylindraceus, pileo concolor, pruinosus. Odor saporque nulli. Sporae 5-6(-6.5) x 3-4 ~tm, ovoideae vel subellipticae, pallidae, tenuitunicatae, !eves, poro distincto instructae. Basidia 4-sporigera. Cheilocystidia I 0-20 x 3-5 ~tm, fusoidea, inconspicua. Fibulae praesentes. Ad detritum putridum Caricis in loco paludoso, Blue Valley, Macon Co., North Carolina, United States. HOLOTYPUS: Petersen no. 2230 (TENN 48119).

Research paper thumbnail of Studies in marasmioid fungi: VII. Marasmius anisocystidiatus, new species in section Sicci

Research paper thumbnail of The Genus Marasmius from the Southern Appalachian Mountains

Research paper thumbnail of Two remarkable taxa of Crepidotus from Bonin Islands (Japan) and new records from the Hawaiian Islands and Papua New Guinea

Research paper thumbnail of New species and new records of Marasmius from Panamá

Nine species of Marasmius from Barro Colorado Island, Panamá are treated. Three species, Marasimi... more Nine species of Marasmius from Barro Colorado Island, Panamá are treated. Three species, Marasimius griseoradiatus, M. scopulatus and M. variabilis are described as new. Six other species, Marasmius helvolus, M. multiceps, M. praecox, M. tageticolor, M. tenuisetulosus and M. leveilleanus are reported from Panamá for the first time. Descriptions and microscopic illustrations are provided for all but M. leveilleanus; photographs are provided for all taxa.

Research paper thumbnail of First Report of <i>Marasmiellus mesosporus</i> Causing Marasmiellus Blight on Seashore Paspalum

Plant Disease, Nov 1, 2010

Research paper thumbnail of Spongiforma squarepantsii, a new species of gasteroid bolete from Borneo

Mycologia, Sep 1, 2011

A gasteroid bolete collected recently in Sarawak on the island of Borneo is described as the new ... more A gasteroid bolete collected recently in Sarawak on the island of Borneo is described as the new species Spongiforma squarepantsii. A comprehensive description, illustrations, phylogenetic placement and a comparison with a closely allied species are provided.

Research paper thumbnail of PHYLOGENETIC PLACEMENT OF AN UNUSUAL CORAL MUSHROOM CHALLENGES THE CLASSIC HYPOTHESIS OF STRICT COEVOLUTION IN THE<i>APTEROSTIGMA PILOSUM</i>GROUP ANT-FUNGUS MUTUALISM

Evolution, Aug 1, 2009

The ∼50 million-year-old fungus-farming ant mutualism is a classic example of coevolution, involv... more The ∼50 million-year-old fungus-farming ant mutualism is a classic example of coevolution, involving ants that subsist on asexual, fungal biomass, in turn propagating the fungus clonally through nest-to-nest transmission. Most mutualistic ants cultivate two closely related groups of gilled mushrooms, whereas one small group of ants in the genus Apterostigma cultivates a distantly related lineage comprised of the G2 and G4 groups. The G2 and G4 fungi were previously shown to form a monophyletic group sister to the thread-like coral mushroom family Pterulaceae. Here, we identify an enigmatic coral mushroom that produces both fertile and sterile fruiting structures as the closest free-living relative of the G4 fungi, challenging the monophyly of the Apterostigmacultivated fungi for the first time. Both nonparametric bootstrap and Bayesian posterior probability support the node leading to the G4 cultivars and a free-living Pterula mushroom. These data suggest three scenarios that contradict the hypothesis of strict coevolution: (1) multiple domestications, (2) escape from domestication, (3) selection of single cultivar lineages from an ancestral mixed-fungus garden. These results illustrate how incomplete phylogenies for coevolved symbionts impede our understanding of the patterns and processes of coevolution.

Research paper thumbnail of Out of the Palaeotropics? Historical biogeography and diversification of the cosmopolitan ectomycorrhizal mushroom family Inocybaceae

Journal of Biogeography, Apr 1, 2009

Aim The ectomycorrhizal (ECM) mushroom family Inocybaceae is widespread in north temperate region... more Aim The ectomycorrhizal (ECM) mushroom family Inocybaceae is widespread in north temperate regions, but more than 150 species are encountered in the tropics and the Southern Hemisphere. The relative roles of recent and ancient biogeographical processes, relationships with plant hosts, and the timing of divergences that have shaped the current geographic distribution of the family are investigated.

Research paper thumbnail of A Unique Ballistosporic Hypogeous Sequestrate Lactarius from California

Mycologia, 2003

Lactarius rubriviridis sp. nov., characterized by hypogeous, sequestrate basidiomes with red late... more Lactarius rubriviridis sp. nov., characterized by hypogeous, sequestrate basidiomes with red latex, green stains, and forcibly discharged, reticulate basidiospores is described and illustrated. During the Spring, the new species forms basidiomes associated with conifers at 1400-1800 m elevation in the Sierra Nevada, and is known from two specimens collected 19 yr apart. Comparisons with the putatively polyphyletic genera Arcangeliella and Zelleromyces, and an accounting of all known members of these genera are provided.

Research paper thumbnail of A unique ballistosporic hypogeous sequestrate<i>Lactarius</i>from California

Mycologia, 2003

Lactarius rubriviridis sp. nov., characterized by hypogeous, sequestrate basidiomes with red late... more Lactarius rubriviridis sp. nov., characterized by hypogeous, sequestrate basidiomes with red latex, green stains, and forcibly discharged, reticulate basidiospores is described and illustrated. During the Spring, the new species forms basidiomes associated with conifers at 1400-1800 m elevation in the Sierra Nevada, and is known from two specimens collected 19 yr apart. Comparisons with the putatively polyphyletic genera Arcangeliella and Zelleromyces, and an accounting of all known members of these genera are provided.