(121) 



up to l~ the segments in length, they are separated bv spaces 

 up to |- the width of the teeth across. Apex of teeth often 

 split or perforated b) r a single opening. The minutely 

 roughened spores measure up to .048 mm. (637). 



Meesca triquetra (L.) Aongstr. {Messia tristicha B. & S.) 

 Klondike River bottom. In fine fruit July 23 (639). 



Pahtdclla squarrosa (L.) Brid. Sterile specimens grow- 

 ing in bogs at Lake Lindeman. Found abundantly in fruit 

 at Dawson July 23, growing in large patches many feet 

 across. In places, specimens were so mixed with Camfito- 

 thecium miens that only the tall seta and capsule of squar- 

 rosa were visible (640). 



Lcptobryum -pyriforme (L.) Schimp. Lake Lindeman 

 and Dawson (641). 



Pohlia nutans (Schreb.) Lindb. ( Webera nutans (Schreb.) 

 Hedw.) Sheep Camp, Dyea Creek, also on an island just 

 below Fort Selkirk (642). 



Pohlia nutans var. ( Webera nutans var.) Lake Linde- 

 man. These specimens are dioicous with appendiculate 

 cilia and costa rough on the back above by the projecting 

 upper ends of the cells. P. nutans longiscta is described as 

 having a rough costa, but it has a seta 3 or 4 times longer 

 than these specimens. Limpricht states it attains a height of 

 10 cm. I have Montana specimens of nutans with paroicous 

 inflorescence, seta 2 or 3 cm. high and costa slightly rough 

 on back above, also specimens with seta 6 cm. high and costa 

 smooth (643). 



Pohlia cruda (L.) Lindb. {Webera cruda (L.) Schimp.) 

 Lake Lindeman (644). 



Pohlia sphagnicola (Brid.) Lindb. & Arn. {Webera 

 sphagnicola Schimp.) Dawson. In fine fruit July 2. 

 Growing with slender, mostly solitary stems up through 

 tufts of Sphagnum and Aulacomnium . The specimens are 

 paroicous not dioicous as usually described, with leaves 

 mostly flat-bordered and entire except a few of the elongated 

 perichaetial, which are slightly serrulate near apex. It is 

 undoubtedly closely related to nutans, differing chiefly in the 



