Greven, H. & Feng, C. 2014. Grimmia crassiuscula sp. nov. (Grimmiaceae) from China, and its separation from Grimmia tergestina and Grimmia unicolor. — Herzogia 27: 137–140.
Grimmia crassiuscula, a new moss species from Inner Mongolia in China, is described. The species was stored in HIMC as Grimmia unicolor, but its extremely small habit, waxy leaves with cucullate apices, costa disappearing in upper part of leaf, and absence of leaf shoulders, readily separate it from G. unicolor. Sporophytes were not found.