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A survey of bambusicolous fungi in Hong Kong and Yunnan, China yielded many specimens of Astrosphaeriella and Roussoëlla. Roussoëlla hysterioides and R. pustulans are new records for Hong Kong and Yunnan; Astrosphaeriella fissuristoma, A. maculans, A. splendida, A. stellata and Roussoëlla intermedia are new records for Hong Kong; Astrosphaeriella bakeriana is a new record for Yunnan. A new species, Roussoëlla angustispora on bamboo from Hong Kong is also reported in this paper.