Henkel, Terry W.http://hdl.handle.net/2148/8022024-03-29T15:58:52Z2024-03-29T15:58:52ZGuyanagaster, a new wood-decaying sequestrate fungal genus related to Armillaria (Physalacriaceae, Agaricales, Basidiomycota)Henkel, Terry W.Smith, Matthew E.Aime, M. Catherinehttp://hdl.handle.net/2148/8062014-01-29T09:10:44Z2010-01-01T00:00:00ZGuyanagaster, a new wood-decaying sequestrate fungal genus related to Armillaria (Physalacriaceae, Agaricales, Basidiomycota)
Henkel, Terry W.; Smith, Matthew E.; Aime, M. Catherine
Premise of the study : Sequestrate basidiomycete fungi (e.g. “ gasteromycetes ” ) have foregone ballistospory and evolved alternative,
often elaborate mechanisms of basidiospore dispersal with highly altered basidioma morphology. Sequestrate fungi
have independently evolved in numerous Agaricomycete lineages, confounding taxonomic arrangements of these fungi for
decades. Understanding the multiple origins and taxonomic affi nities of sequestrate fungi provides insight into the evolutionary
forces that can drastically alter basidioma morphology. In the neotropical rainforests of the Guiana Shield, we encountered a
remarkable sequestrate fungus fruiting directly on decaying hardwood roots. The fungus ’ singular combination of traits include a
wood-decaying habit; black, verrucose peridium; reduced stipe; and gelatinized basidiospore mass.
• Methods : Guyanagaster necrorhiza gen. et sp. nov. is described. Macro- and micromorphological characters were assessed and
compared to most similar taxa. To determine the phylogenetic affi nities of the fungus, DNA sequence data were obtained for
the 18S, ITS, and 28S rDNA, RBP2 , and EF1 α regions and subjected to single- and multi-gene analyses. DNA sequences from
fungal vegetative organs growing on decaying woody roots confi rmed the wood-inhabiting lifestyle of Guyanagaster .
• Key results : Guyanagaster is morphologically unique among sequestrate fungi worldwide. Phylogenetic evidence places
Guyanagaster in close relation to the wood-decaying mushroom genus Armillaria in the Physalacriaceae (Agaricales, Agaricomycetes,
Basidiomycota).
• Conclusions : Guyanagaster represents an independently evolved sequestrate form within the Physalacriaceae. Although
molecular data confi rm that Guyanagaster is closely related to Armillaria , the unusual features of this fungus suggest a case of
radically divergent morphological evolution.
2010-01-01T00:00:00ZFistulinella cinereoalba sp. nov. and new distribution records for Austroboletus from GuyanaFulgenzi, Tara D.Halling, Roy E.Henkel, Terry W.http://hdl.handle.net/2148/8052013-12-02T21:43:10Z2010-01-01T00:00:00ZFistulinella cinereoalba sp. nov. and new distribution records for Austroboletus from Guyana
Fulgenzi, Tara D.; Halling, Roy E.; Henkel, Terry W.
Fistulinella cinereoalba sp. nov., Austroboletus
rostrupii, previously known from southeastern
Asia, and Austroboletus festivus from Brazilian Amazonia
are described for the first time from the Guiana
Shield. These boletes were collected from tropical
forests dominated by ectomycorrhizal Dicymbe spp.
(Fabaceae subfam. Caesalpinioideae) in the Pakaraima
Mountains of western Guyana.
2010-01-01T00:00:00ZNew species and distribution records of Clavulina (Cantharellales, Basidiomycota) from the Guiana ShieldHenkel, T.W.Aime, M.CUehling, Jessie KarenSmith, M.E.http://hdl.handle.net/2148/8032013-12-02T21:43:11Z2011-07-01T00:00:00ZNew species and distribution records of Clavulina (Cantharellales, Basidiomycota) from the Guiana Shield
Henkel, T.W.; Aime, M.C; Uehling, Jessie Karen; Smith, M.E.
Two new species of Clavulina Schroet.
(Clavulinaceae, Cantharellales, Basidiomycota) and
new distribution records for Clavulina amazonensis
Corner and Clavulina sprucei (Berk.) Corner are
described from the Pakaraima Mountains of Guyana,
in the central Guiana Shield region. These fungi
occur in rainforests dominated by ectomycorrhizal
(ECM) trees of the leguminous genus Dicymbe
(Fabaceae subfam. Caesalpinioideae). Macromorphological,
micromorphological and habitat data are
provided for each species. Nuclear ribosomal DNA
sequences of the internal transcribed spacer region
and 28S subunit were obtained from the type and
other collections of each new species and from
representative collections of C. amazonensis and C.
sprucei. The two new species, Clavulina kunmudlutsa
sp. nov. and Clavulina tepurumenga sp. nov., constitute
important edible fungi for the Patamona
Amerindians. Our specimens of C. sprucei represent
the first reports of the species since 1853 as well as a
range extension of nearly 1500 km, while sequence
data from basidiomata as well as ECM roots suggest
that this taxon consists of a cryptic species complex.
Thesis (M.S.)--Humboldt State University, Biological Sciences (Mycology), 2012
2011-07-01T00:00:00Z