Abstract
During intensive studies of the taxonomy and ecology of myxomycetes in Cat Tien National Park (southern Vietnam), two species of Diderma (myxomycetes) were collected during surveys carried out in December 2010 and similar surveys carried out in November 2011 and 2012. These new species, D. cattiense and D. pseudotestaceum, are described and illustrated. D. cattiense resembles D. subasteroides in overall shape, colour and size of the sporocarps but has smaller spores and the ornamentation of spores and the capillitium are different. The main morphological differences between D. pseudotestaceum and D. testaceum lie in shape, colour of sporocarp, columella, spore size and ornamentation. A phylogeny based on the small ribosomal subunit (SSU) and elongation factor 1 alpha (EF1a) genes placed these new species in clades far apart from other species of Diderma.
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