On the characterization and the Taxonomic status of th group of Fissidens species known as Pachyfissidens

It is demonstrated that the characters which sofar have been considered to be typical for the subgenus Pachyfissidens are also found in several species which on good grounds are included in the subgenus Fissidens. Therefore Pachyfissidens can not be maintained as a subgenus; however, on account of a certain similarity in habit caused by the thickness of the leaves and on the ground of the fact that in all its species a central cylinder is normally lacking, Pachyfissidens is retained as a section. F. rochensis Broth., a species formerly placed in Pachyfissidens is transferred to the section Bryoidium.