154 
as long as the sporesac, and more or less strangulate when dry. 
Leaves narrow, with the vein ending in the apex, teeth reflexed in 
pairs, cilia 8 or 16. Several of these species are poorly under- 
stood, or have been collected only once. 
32. ORTHOTRICHUM PALLENS Bruch. 
Leaves blunt, strongly papillose, calyptra naked, teeth united 
in pairs, reflexed when dry, cilia 16, alternately longer and shorter; 
stomata immersed but wide open, often showing the outlines of 
the guard cells. - | 
Type European, grows on trees, especially on beeches, in the 
mountains of Europe, rarely on rocks. It has been credited to 
North America by Mitten, from specimens collected by Lyall, 
Pack River, British Columbia. (Journ. Linn. Soc. 8: 23, 1865.) 
Not since reported. 
Var. parvum Hedw. (Hedwigia 12: 1873; 32: 284, 1893.) 
Plants smaller, yellowish green, the capsules with neck and 
pedicel not reaching 2mm. in length. 
Collected by R6ll in Yellowstone National Park, Wyoming. 
33. ORTHOTRICHUM CANADENSE Br. and Sch. 
_. We have already discussed at length the merits of this species- 
(Bull. Torr. Bot. Club, 21: 9, 1894). 
Drummond’s Nos. 149 and 151, from Upper Canada, 
been referred to this species and the following one. H 
have | 
34. ORTHOTRICHUM ALPESTRE Hornsch. . : 
Differs from OQ. pallens in having only 8 cilia and a hairy 
calyptra; the teeth are striate at apex. More closely related to 
OV. stramineum, having been referred to it as a variety. \ 
Type locality: European, on rocks in Alpine regions. Has 
been collected by R. S. Williams, Belt Mountains, Montana, 
No. 96. | : 
35. ORTHOTRICHUM OCCIDENTALE James, Bot. King’s Exp. 402 
(1871). aa 
Var. majus L. and J. Man. 169 (1884); Sull. Icon. Muse. Suppl. 
69, 7. 57 (1874). ai 
As already remarked in the BULLETIN (21: I0, 1894), ie 
variety is poorly understood, and is based on two specimens, one 
of which, Drummond's No. 149, was included in O. Canadensé al 
and Sch., and Watson’s specimens from Utah. The name give? 
by James has priority over the varietal name in the Manual, ig 
