A key is given to identify the species of genus Platystoma. Theesespecies are dis- tinguished in six groups, each group with 1-2 taxa:group seminationis(figs 1-6), group plantationis-pubescens(figs7-15), group bezzii-subtile(figs 16-21), group gemma-tionis-tegularium(figs 22-29), group insularum-corticarum(figs30-39), group lugubre (figs 40-46). Examined specimens came fromRondani collection(lectotypes des. Soos), Bezzi Coll.
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