2i8 HOW TO KNOW THE MOSSES 



Stems stout, rigid, erect or ascending; 1-4 inches long; 

 pinnately or irregularly branched; ends of stems and 

 branches pointed by the leaves rolled together (cuspidate). 



Leaves straight , large , erect or spreading; 

 bright green, yellowish- or golden-brown; 

 glossy. 



Seta 1-3 inches long; reddish. 

 Capsule long-cylindrical, inclined and 

 curved; mature in summer. 

 Operculum cone-shaped. 

 Range, Canada and the northern United 

 States; Europe; Asia; Africa. 



Acrocladium cuspidatum (L.) Lindb. 

 {Hypnum cuspidatum L., Calliergon 

 cuspidatum Kindb.) is not found com- 

 monly in all localities. The cuspidate or 

 pointed stems and branches are the dis- 

 tinguishing characteristics. In general 

 growth it resembles Hypnum Schreberi (p. 229), but 

 it usually grows in wetter places and does not have 

 reddish stems as does H. Schreberi. The stems are 

 more rigid and more erect than other mosses growing 

 in similar places. 



Acrocladium cus- 

 pidatum 



End of branch 

 enlarged. 



65. HYGROHYPNUM Lindb. 

 (Hy-gro-hyp-num) 



A genus of several species found chiefly in mountain 

 or hill streams; four of most frequent occurrence are 

 given below. Name derived from the Greek for '' wet " 



