Macalpinomyces flaccidus sp. nov. and Urocystis poae-palustris new to China and Asia

摘要

A new species, Macalpinomyces flaccidus on Pennisetum flaccidum is described, which was collected from Yunnan Province, China. Urocystis poae-palustris on Poa supina, which is new to China and Asia, is also reported. A new Macalpinomyces species on Pennisetum flaccidum was collected in Yunnan Province, Southwestern China. Its sori are covered by a peridium, and lack a columella. The species is peculiar in forming 3-7 fascicle-like sori in some spikelets of an inflorescence. So far, only one Macalpinomyces species, M. tilletioides Vanky (Vanky 2005) was known on Pennisetum, The new species differs from M. tilletioides in having cylindrical or filiform, 8-21 mm long sori, sparsely echinulate ustilospores, and small sterile cells (5-10 x 5-9 (im), while M. tilletioides has short sori (2-3 mm in length), densely verrucose-echinulate ustilospores, and large sterile cells (7-16 x 6.5-12 um). It is described as: