HYPNACEAE 213 



(p. 254) have short thick capsules and the lower part of 

 the stems is not leafless. The leaves of the Brachythe- 

 ciums are large and easily seen, while those of Bryknia 

 are sometimes too small to be seen, but the branches 

 of Bryhnia usually curl a little when dry, while those 

 of Hygroamhlysiegium remain straight. Oxyrhynchium 

 (p. 251) grows on rocks in brooks, but is a coarse, robust 

 moss. 



Other mosses growing on rocks in water and having 

 the lower part of stems leafless, are Fontinalis (p. 175), 

 and the acrocarpous mosses Rhacomitrium (p. 113) and 

 Grhnmia apocarpa var. rivularis (p. iii). Fontinalis 

 has much longer stems and branches and larger leaves. 

 RJiacomitrium and Gnmmia, which have the capsule at 

 the apex of the stem, branch by forking, and have 

 larger, coarser leaves that are very wide-spreading 

 when moist, and closely folded when dry, and are a 

 very dark green, almost black on the older part of the 

 plants. Individual plants of the acrocarpous mosses 

 are easily separated, but the pleurocarpous mosses 

 form more tangled mats, so that it is not always easy 

 to separate a long piece of the stem. 



62. DREPANOCLADUS (C. Mull.) Roth 

 (Dre-pa-no-cla-dus) 



A genus of many species widcl}' distributed; the two 

 of most frequent occurrence are given below. Name 

 derived from the Greek for '' sickle " and '' plant,'* 



