u 1 I ll A HAND-] i • 





THE DITRICHUMS* 



THE Dark Ditrichum \D. vdginans (Sulliv ) Hampe] has a 

 habitat very similar to that of CeratodoD and at hist sight 

 might be confused with it. The capsules are much the 

 same color and somewhat furrowed, hut it is smaller with more 



Fig. 10 a, b, and c, Ditrichum pallid um, : ■axinans and tortile, 

 repectively, X a. d, Capsule of D. pallidum 2>>. e, Capsuli 

 D. vaginans X 10. f, Capsule of /). tort He 



erect symmetric capsules that have much less conspicuous furrows 

 when dry. It matures its spores late in autumn, which of itself 

 will be sufficient readily to distinguish it from Ceratodon. It is 

 not frequent in the more nothern portion of our range 



The Brown Ditrichum | D. tdrtile (Schrad ) Hampe] is fre- 

 quent throughout in moist sandy or gravelly soil by roadside 

 in old fields. It is closely related to the Dark Ditrichum. but is 

 smaller, with light brown capsules which mature at about the 

 same time and are smooth when dry. 



The Yellow Ditrichum \D. pallidum (Schreb.) Hampe] is 

 more abundant southwards ami in the lowlands, and is much 

 larger than the other two species. It is easily recognized by its 

 bright yellow seta and unsymnictric capsules, which mature in 

 winter. It is most frequent in dry sandy soil. 



* Ditrichum Timm. Leptotrickum Hampe. 



