A taxonomic conspectus of seven genera of the Pleurospermum group is represented; it contains two species of Pleurospermum (s.str.), four species of Pterocyclus, one species of Trachydium, four species of Keraymonia, five species of Pseudotrachydium gen. nov., 15 species of Aulacospermum, and three species of Hymenolaena. For all names (accepted and taxonomic synonyms) the type materials are cited; species distribution are given according to countries and provinces. Nine new nomenclatural combinations are proposed (cf. p. 551–552).
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Pimenov et al. (2000) studied this question.