BRYACEAE 131 



found on dry ground, on rocks, and sometimes in the 

 crevices of brick walls or stone walls. The seta is 

 short, about Yi inch long, and the capsule small, 

 maturing in the fall. This species sometimes fruits 

 abundantly. 



Other species of Bryiim are likely to be collected 

 occasionally and are not easily identified, but the 

 Bryum capsule is readily distinguished from all others 

 except that of Pohlia. See under that genus (p. 128) for 

 comparison. The capsule of Mnium (p. 134) is hori- 

 zontal or drooping like that of Bryum, but the Mnium 

 capsule is cylindrical throughout, — ■ that is, the same 

 width throughout, while the Bryum capsule has a 

 more or less distinct neck, making the lower part nar- 

 rower than the upper portion; yet this character is not 

 so marked as in Leptobryum (p. 126). 



29. RHODOBRYUM (Schimp.) Hamp. 

 (Rho-do-bry-um) 



A genus containing many species, one of which is fre- 

 quent and so strikingly characteristic that it is easily 

 recognized. Name derived from the Greek for ''rose," 

 and Bryum, referring to the leaves forming a rosette. 



Rhodobryum ontariense (Lindb.) Paris is usually 

 given as R. roscum (Weis) Limpr. {Bryum roscuyn 

 Schreb.); but the plants commonly collected in our 

 range have a longer midrib than is described under R. 

 roseum. 



