FIELD BOOK OF PONDS AND STREAMS 



concealed by the leaves. Cool streams, North America and 

 Europe. 



Fig. 55. — Branches of two common fountain 

 mosses: i, Fontinalis; 2, leaf arrangement of Fonti- 

 nalis gigantea; 3, leaf arrangement of Fontinalis 

 Nov(B-AngU(E. (2 and 3 from Grout.) 



Hypnums — Hypnacece 



Water hypnums, Hygrohypnum. — The first part of the word 

 Hygrohypnum, derived from the Greek, well names these 

 mosses " wet hypnums. " They grow in bright green or yellow 

 green patches on the rocks in and near the beds of swift 

 streams. Hygrohypnum ochraceum (Fig. 56), whose branches 

 are 2 to 4 inches long, larger than most of the genus, can be 

 found in almost any mountain brook. 



Occurrence. — {H. ochraceum) — Northern and central North 

 America. Fruits in spring and early summer. 



64 



