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Cordyceps is one of the target genera for modern mycological studies. Among themCordyceps sinensis is the most famous but poorly defined species because the fungus is endemic in districted regions of east Eurasia. We have explored the various growing regions and habitats where the fungus grows in the wild. We also examined authentic cultures for the species. We analyzed the sequences of ITS1, 2 and 5.8 S rDNA regions ofC. sinensis materials collected from 11 localities of southwestern China. Phylogenetic analyses were performed with these sequences and with additional sequences obtained from GenBank. All sequences formed a single cluster, which comprised two subgroups. Our results strongly suggested that intraspecific variation was rather small and that some species that are morphologically similar toC. sinensis but with different names might be synonymous withC. sinensis. The difference in the pharmaceutical activity among these collectedC. sinensis from different regions will be studied in the future.

Species of Tremella occurring in China have been little studied (Liu et al, 1983; Peng, 1984). From observations elsewhere, one can expect that most of the Tremellas in temperate China are the common taxa occurring in Europe and North America. However, Asia seems to be especially rich in species of both the Sirobasidiaceae and Tremellaceae (RJB, pers. obs.) and many taxa there remain to be described. One such, the object of this paper, is a species of Tremella parasitizing Stereum hirsutum (Willd.: Fr.) S. F. Gray and allied taxa growing on Quercus and Betula spp. The new species is one of a group with rep? resentatives known from North America, South America, Asia, and Europe, all parasitizing Ste? reum mycelium and with basidiomes consisting of both host and parasite hyphae. In most, hy? phae of the host form a white, fibrous to fleshy core surrounded by a gelatinous layer of mainly Tremella elements. Alternatively, the lobes can be either hollow or with only seattered hyphae of the host extending into the basidiocarp, as in many fructifications of T. aurantia Schw.: Fr. Tremella aurantialba is so-named because ofthe

ella scalaris Manier, Rioux & Whisler ex Manier & Lichtwardt and Stachylina reflexa Lichtwardt & Williams have disarticulating generative cells; however, in these species mature trichospores remain attached to their generative cells (Licht? wardt and Williams, 1988). Lichtwardt (1986) has noted that trichospore appendages allow entanglement with detritus and may prevent spore drift in flowing waters. Bo? jamyces repens occurs in lentic waters and, therefore, does not risk loss of propagules by downstream drift, even though the trichospores lack appendages. In the laboratory, trichospores from B. repens thalli that develop undisturbed, lie free in the lumen of exuviae. In a lake, trichospores may remain with exuviae and be ingested by mayfly nymphs along with other detritus.