Dicranum transsylvanicum (Musci, Dicranaceae), a new species from Romania

Dicranum transsylvanicum Lüth is described and illustrated as a new species from the Apuseni Mountains in western Romania. The new species resembles D. scoparium Hedw. in habit and D. crassifolium Sérgio, Ochyra & Séneca in microscopic details, especially in its partially bistratose lamina cells in the upper half of the leaf, but differs in having a strongly spinose leaf lamina on the dorsal side, irregularly dentale leaf margins in the upper part and a triangular stem in transverse section.