Abstract
Two new myxomycete species recorded from the semiarid lands of the Neotropics are described. Cribraria fragilis sp. nov. is distinguished from all other species of the genus by its unique spores, which have smooth bands arranged in longitudinal arcs, and by the minute sporocarps each with a deep calyculus and without a peridial net. Diderma acanthosporum sp. nov. has a unique combination of characters; these are a pseudoaethalioid fructification with stalked sporocarps and depressed sporothecae, a calcareous, crustose external peridial layer, and large spores, paler on one side and with long spines. Comments on the distribution and ecology of these two species are included.
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