ENTODONTACEAE 191 



The Entodons can generally be distinguished by the 

 very glossy, light or yellow-green leaves, closely folded in 

 E. scductrix, and more or less flattened in E. clador- 

 rhizans. They are not so common as several other 

 mosses; for instance, Stcreodon Haldaniamis (p. 237) 

 and some of the Brachytheciums (p. 244), which may 

 sometimes be a rather light green, slightly glossy, and 

 have nearly cylindrical branches. But these charac- 

 teristics are not so decided as in the common Entodon, 

 and in nearly all cases, where there is a question about 

 the color or the cylindrical branches, it will be safe to 

 say that Entodon seductrix has not been collected. By 

 holding dry plants to the light, leaves will be seen 

 sticking out around the branches in Stcreodon and 

 Brachytheclum^ but will not be seen in E. seductrix. 



51. PLATYGYRIUM Bryol. Eur. (Pla-ty-gy-ri-um) 



A genus of several species, one of which is found in 

 North America. Name derived from the Greek for 

 *' large " and '' ring," referring to the row of cells at the 

 mouth of the capsule. 



Platygyrium repens (Brid.) Br>'ol. Eur. is found in 

 most localities on decaying wood, and on roots and 

 trunks of trees, especially chestnut and beech; rarely 

 on rocks; fruit frequent. 



Plants forming dense, flat mats, usually rather dark 

 green. 



Stems prostrate, creeping; irregularly or sometimes 



