A new species of Cryptothallus from Costa Rica

Cryptohallus hirsutus is described as a new species from Costa Rica differing from C. mirabilis of oceanic northwestern Europe in its indehiscent capsules with no elaterophore and spores not coherent as tetrads. The faintly green gametophytes are particularly hairy and rhizoidal on both surfaces. The wide disjunction of these two underground species, surely disadvantaged in spore dispersal, supports recognition at a specific level.