BRACHYTHECIACEAE 255 



Bryhnia novae-angliae (Sull. & Lesq.) Grout 

 {BrachytJiccium novae-angliae (Sull. & Lesq.) Jaeg. & 

 Saucrb.) is most frequently found on stones in beds of 

 brooks or in wet, shady woods. The distinguishing 

 characteristics are best seen in dry plants: the slight 

 curl of the ends of the stems and branches, and the 

 small leaves not tightly folded, which give the stems 

 and branches rather a rough appearance. When the 

 plants are fruited, the short, stout capsule distinguishes 

 Bryhnia from other mosses, except BrachytJiccium 

 (p. 244), growing in similar places. Bracyhlhecium rivu- 

 lare (p. 247) and Brachythecium plumosum (p. 247) are 

 also found in brooks, but they have larger leaves, not 

 folded when dry, and straighter branches. This dis- 

 tinction is also true of other Brachytheciums growing 

 on wet ground. Hygroaniblystegium (p. 211) also has 

 straighter branches without the numerous lateral 

 branches found in Bryhnia. Bryhnia is much larger 

 than Amblystcgium serpens (p. 209), and the leaves are 

 much shorter than in A. riparium (p. 209). Bryhnia 

 may be known from Stereodon (p. 231) by the less 

 creeping stems, without the flattened branches or 

 curved leaves. Stereodon Haldanianus (p. 237) has 

 straighter branches and larger leaves. Oxyrhynchiiun 

 (p. 251) is a much stouter moss, with larger leaves, 

 darker green than Bryhnia, 



