(H4) 



sufficient to separate the plant. Macoun's no. 66 is this 

 species, also Leiberg's 232. In European collections, "485 

 Jack, Leiner and Sitzenberger Kryp. Badens, "' " a" is this 

 and " c" is jlexicaule. 1307 Rabenhorst, Bry. Eur. looks 

 much like this but is Dicranodontium. " in Bryotheca 

 Silesiaca" and " in Wilson, Musci Brit." are this species. 



Sterile specimens only were collected at Dawson. The 

 description is drawn up from specimens collected at Columbia 

 Falls, Mont., July, 1892. In the plate the teeth are probably 

 figured too short, the only available specimen being in poor 

 condition. The plant grows on both earth and rock and 

 rarely fruits (568). 



Ditrichum jlexicaule (Schleich.) Hampe. (Leftotrichum 

 flcxicaule Hampe.) Common about Dawson in swampy 

 places. These specimens are similar to 961 , Rabenhorst, Bry. 

 Eur. The leaf-cells below are often much pitted, perichaetial 

 leaves gradually narrowed and leaf towards apex only slightly 

 serrulate. Occasionally there is a distinct cluster of alar cells 

 found in both European and American specimens (567). 



Ditrichum Jlexicaule densum (B. & S.) Braithw. Speci- 

 mens about 1 cm. high, collected between the Big and Little 

 Salmon rivers, in good fruit June 16. This plant has the 

 habit of D . homomallum and Macoun's no. 8, so called, be- 

 longs here. It is at once distinguished from homomallum bv 

 the short, often transversely elongated cells near middle of 

 leaf toward margin, also the rectangular basal cells are only 

 i as long. These specimens appear quite distinct iromjlex- 

 icaule by their small size, short, nearly entire leaves and 

 scarcely or not pitted cell walls, the teeth also are distinctly 

 articulate ; possibly, however, all these characters are too 

 variable to make specific distinctions (566). 



Desmatodon cernuus (Hiiben) B. & S. Dawson (570). 

 Barbula brevirostris (Hook. & Grev.) Bench. On earth- 

 covered stumps and bare clayey soil about Dawson (571). 



Barbula fallax rccui'vifolia Wils. (Barbula rcjlcxa Brid.) 

 Dawson. Growing in large tufts on rock (572). 



Barbula fragilis (Drurnm.) B. & S. Dawson. In damp 



