云南景迈山古茶树腐生炭角菌目两新种(子囊菌门,粪壳菌纲)OA

The Jingmai Mountain Ancient Tea Forest,located in southwestern Yunnan Province,China,is one of the world's best-preserved and largest ancient tea forest landscapes and possesses significant ecological and cultural value.However,systematic research on the fungal diversity associated with tea trees in this region remains limited,particularly regarding saprobic fungi inhabiting dead branches.In this study,saprobic fungi associated with dead branches of tea trees Camellia sinensis were investigated in the Jingmai Mountain Ancient Tea Forest.Specimens were examined through single-spore isolation,strain purification,and morphological observations,combined with phylogenetic analyses based on multiple gene loci.The results revealed two taxa that differ significantly from known species in both phylogenetic placement and morphological characteristics including stromatal structure,ascus and ascospore morphology and size.These taxa are described herein as new species,Diatrype jingmaiensis and Nemania jingmaiensis.Diatrype jingmaiensis is characterized by its dark olivaceous green stromata,and uniseriate,yellow,allantoid,and aseptate ascospores.Diatrype jingmaiensis has semi-immersed stromata,and ascospores ellipsoid to slightly fusoid,with a fairly conspicuous,straight,almost spore-length germ slit on the least convex side.