Abstract
Based on a study of ca. 120 Fissidens species covering all sections and subgenera, there types of costae are recognized. One type is characteristic of sect. Amblyothallia and of F. asplenioides, F. fasciculatus and F. plumosus (the fasciculatus-group); the second of subg. Serridium, subg. Fissidens sect. Crispidium
and F. grandifrons (subg. Pachyfissidens) and the third type fo subg. Fissidens sect. Aloma, sect. Crenularia, sect. Semilimbidium, sect. Pycnothallia, and sect. Areofissidens, subg. Octodiceras, and subg. Sarawakia.
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