中国云南地星属一新种OA

Geastrum,the most species-rich genus within the Geastraceae,exhibits a cosmopolitan distribution.Its diagnostic characteristic is the formation of stellate(star-like)basidiomata in most species,which serves as a key morphological feature for field identification.Based on morphological observations and phylogenetic analysis,a new species,Geastrum cangshanense,from Yunnan,southwest China,was described.G.cangshanense exhibits scattered to clustered unexpanded basidiomata(1.5-1.8×1.7-2.0 cm),with shallowly saccate to arched and 7-8 exoperidial rays,broadly conical peristome,silkily fibrillose,apically projecting,darker than the endoperidium and sharply delimited,and globose basidiospores(3.7-5.1 μm).Sequences of the internal transcribed spacers(ITS)and large subunit(LSU)of nuclear ribosomal DNA(nrDNA)were generated,and phylogenetic analyses were conducted using maximum likelihood and Bayesian inference methods.Phylogenetic analyses based on the combined nrITS and nrLSU dataset indicated that G.cangshanense formed a distinct lineage within Geastrum.Detailed descriptions,illustrations and phylogenetic results of the new species are presented herein.