found on rocks the patches are often of much greater extent, 
spreading over the surface for many feet, when the plant may 
be compared to pieces of rough, dark-green plush. There is 
always a peculiarly rigid, harsh feel by which this plant may 
be distinguished from C. scopulorum. From C. pannosa it differs 
in its shorter filaments, and the more tooth-like bundles ito 
which they are aggregated. 
Fig. 1. Patch of CaLotHrix HypNorpEs :—the natural size. 2. Tooth-like 
fascicles, from the same :—slightly magnified. 3 and 4. Filaments, and 
apices of the same :—more highly magnified. 
