(114) 
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 flextcaule. 1307 Rabenhorst, Bry. Eur. looks 
much like this but is Dzcranodontium. ‘*111 Bryotheca 
Silesiaca” and ‘* 111 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 flexicaule (Schleich.) Hampe. (Leptotrichum 
flexicaule 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 flexicaule 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 by 
the short, often transversely elongated cells near middle of 
leaf toward margin, also the rectangular basal cells are only 
4 as long. These specimens appear quite distinct from flex- 
zcaule 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 recurvifolia Wils. (Barbula reflexa Brid.) 
Dawson. Growing in large tufts on rock (572). 
Barbula fragilis (Drumm.) B. & S. Dawson. In damp 
