(Ill) 



Dicranum Blyttii B. & S. Rather common on rock 

 about Lake Lindeman. Some specimens are dioicous, male 

 plants occurring with three or four antheridial buds. The 

 leaf-cells vary considerably in width below, with walls some- 

 times thickened and pitted, especially in the perichaetial 

 leaves a little above the base (533). 



Dicranum elongatum Schleich. Dawson. Very com- 

 mon on both old stumps and rocks in damp places. Some 

 of the specimens might be referred to var. orthocarpum if 

 that is worth recognition as a variety (534). 



Dicranum fuscescens Turn. On rock along Dyea Creek 

 and on earth at Lake Lindeman (536). 



Dicranum congestum Brid. On swampy ground at Daw- 

 son. Distinguished from the preceding by the wider leaf 

 point with cells elongated-oval, not short and angular above. 

 In both species the cell walls are more or less porose and the 

 nerve at base varies from \ to \ the width of leaf base (537). 



Dicranum Muhlenbcckii B. & S. Growing among bould- 

 ers at Lake Lindeman. This has small, angular leaf-cells, 

 often only .006 x .006 mm.-.oo6x .008 mm. extending § down 

 the leaf or more. The cell walls may be more or less po- 

 rose. The costa at base is about \ width of leaf base (538). 



Dicranum fragilifolium Lindb. Very common on de- 

 cayed logs about Dawson. Perichaetial leaves rather grad- 

 ually narrowed to the subula with cell walls porose in lower 

 part. Other leaves scarcely or not porose. The costa often 

 well defined below and broad, over \ width of leaf base (535). 



Dicra?ium angustum Lindb. Sterile specimens collected 

 at Lake Lindeman in swamps and found in good fruit at 

 Dawson in July. This is a more slender plant than scopa- 

 rium with erect-spreading, nearly straight, smooth and en- 

 tire leaves, giving a somewhat bristly appearance to the 

 stems. The leaf-cells are elongated throughout often from 4 

 to 8 times longer than wide in upper leaf, with walls strongly 

 porose, at least below. Nerve indistinct and narrow a short 

 distance above base. Perichaetial leaves abruptly narrowed 

 to a smooth subula about J the length of blade. Capsule 



