Abstract
Barbula convoluta Hedw. var. commutata (Jur.) Husn. differs from var. convoluta not only by characters such as larger size, darker colour and undulate leaf margins, as mentioned in the literature, but, in addition, by a different transverse section of the stem, different basal laminal cells, different papillae on the leaf surface, a different spore ornamentation and different isozyme systems. It should therefore be regarded as a separate species. In this case, the legitimate name would be Barbula sardoa (Schimp.) J.-P. Frahm, since Barbula convoluta var. sardoa Schimp. is revealed to be an earlier synonym of var. commutata.
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