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Impatiens yangshanensis A.Q. Dong & F.W. Xing sp. nova (Balsaminaceae) from Guangdong, China, is described and illustrated. It is morphologically similar to I. macrovexilla, but differs mainly by its biid spur, 2-bracted pedicel and lateral united petals with triangular basal lobes, acuminate apex, and dolabriform distal lobes. It also resembles I. pterosepala, but that species differs mainly in its 1-lowered inflorescence, 1-bracted pedicel and oblong basal lobes of lateral united petals. [ABSTRACT FROM AUTHOR]

Hypodematium humile F. G. Wang & F. W. Xing and H. villosum F. G. Wang & F. W. Xing, two new species of Hypodematiaceae from Guangdong, southern China, are described and illustrated. Their spore morphology, ecology and conservation status are also presented. Hypodematium villosum differs from H. fordii in having glabrous petiole except on the base, both surfaces of lamina, rachis and costa densely covered with long acicular hairs ca. 1 mm long, and apex of pinnulets acute. Hypodematium humile differs from H. glandulosum in having leaves 8-11 cm long with both surfaces of lamina, rachis and costa sparsely covered with rod-shaped glandular hairs and caducous indusium. A key to the species of Hypodematium known from Guangdong Province is provided. The systematic relationship of Hypodematium with Leucostegia is also discussed. [ABSTRACT FROM AUTHOR]