(145) 



Hypnum scorpioides L. (Scorpidium scorpioides (L.) 

 Limpr.) Just above Lake Lindeman in blackish mats almost 

 covering the bottom of a small pond 12 or 15 inches below 

 the surface. The plants have the appearance of great age, 

 most of the leaves being worn into shreds (783). 



Hyfnum scorpioides gracilescens Sanio. In dried-up 

 swamp a few miles below White-horse Rapids, covering ex- 

 tensive areas with a mat up to 18 cm. thick. The stems are 

 slender, with short, distant branches and leaves distantly 

 placed (793). 



Hylocomium proliferum (L.) Lindb. (//. splendcns Hedw.) 

 Lake Lindeman, Thirty-mile River and Dawson. An 

 abundant species occasionally fruiting. Plants variable in 

 size and color, the long stems sometimes scarcely branching 



(784). 



Hylocomium Pyrenaicum (Spruce) Lindb. (H. Oakesii 



Sulliv.) Lake Lindeman, on rock (785). 



Hylocomium squarrosum (L.) B. & S. Lake Lindeman 

 (786). 



Hylocomium triquetrum (L.) B. & S. Yukon River below 

 Ft. Selkirk and Klondike River bottom near mouth. Not 

 apparently very common (787). 



Hylocomium loreum L. Canon City, Dyea Creek and 

 Skagway. Not observed on the Yukon River (788). 



Hylocomium rugosum (Ehrh.) De Not. {Hypnum rugosum 

 L.) Lake Marsh and Mile's Canon, sterile specimens abun- 

 dant. Dawson, not rare in fruit (794). 



Description of Plates. 



Camera lucida drawings reproduced without reduction. 



P1.ATE 15. Ditrichnni giganteum. 



Figs. 1 and 2. Plants, natural size. 



Fig. 3. Capsule enlarged. 



Fig. 4. Perichaetium, X 9- 



Fig. 5. Inner perichaetial leaf enlarged. 



Fig. 6. Apex of stem leaf, X 285. 



Fig. 7. Part of peristome and capsule, X 285. 



Fig. 8. Marginal cells >£ down leaf, X 285. 



