I40 HOW TO KNOW THE MOSSES 



Leaves relatively short and broad; sometimes flat as though 

 pressed, and sometimes turned to one side, especially in 

 the new growth; not much changed when dry; yellowish- 

 green or olive-green. 



Seta usually about i inch long; reddish- 

 brown. 



Capsule inclined; long-cylindrical; reddish- 

 brown when mature; grooved when dry; mature 

 in May or June. 

 Operculum short-beaked. 

 Range, the eastern part of the United States 

 to Wisconsin and Texas; Asia. 



Aidacomnium 

 heterostichum 



Leaf and cap- 

 sule enlarged. 



Aulacomnium heterostichum has leaves 

 similar in shape to those of Fissidens 

 (p. 97) and some of the Mniums, the 

 preceding genus. It is distinguished at once from 

 Fissidens by having more than two rows of leaves, 

 and from Mnium by the leaves being closer-set, 

 and not changing much when dry. When the leaves 

 turn to one side this moss does not suggest either Fissi- 

 dens or Mnium; the manner of branching and the cap- 

 sule are also different. 



Two pleurocarpous mosses, Neckera (p. 185) and 

 Homalia (p. 186), grow on trees and have broad leaves 

 lying fiat, but the stems are more branched and the 

 capsules are not terminal. 



The somewhat flattened appearance of this Aula- 

 comnium may resemble some of the leafy hepatics, but 

 the leaves are more pointed and are a lighter green. 

 (See Introduction, p. 6.) 



