146 
16. ORTHOTRICHUM SCHLOTTHAUERI Vent. Bot. Cent. 44: 416 
(1890). Hedwigia, 32: 216, 223 (1893). Rev. Bryol. 19: 18 
(1892). 
This species has exserted cylindric capsules not sulcate, teeth 
erect, united in pairs, but split nearly to base, papillose; cilia 
more or less fugacious or deficient. 
Type from the Rocky Mountains at Garrison, Montana, Roll, 
also collected in Sun River Cafion, Montana, by R. S. Williams, 
No. 97, named by Venturi. . 
IV. Group oF O. AFFINE. 
17. ORTHOTRICHUM AFFINE Schrad. Spic. fl. Germ. 67 (1794): 
Bull. Torr. Bot. Club, 20: 394 (1893). 
This species occurs in the Eastern States, around the Great 
Lakes, and in the Northeastern provinces of Canada. : 
Var. neglectum (Schimp.) Vent. Musc. Gall. 171 (1887). Speci 
mens collected by J. B. Leiberg at Lake Pend d’Oreille on trees; 
No. 88, have recently been determined by Dr. Venturi as ies - 
variety. It has not been previously reported from North America. — 
V. Group oF O. LYELtil. 
In a recent number of the BULLETIN (20: 397, 1893) we &* 
pressed our views on this group. Dr. Venturi’s remarks in Hed- 
wigia, 32: 273, 286 (1893)) will be found interesting. We have 
another synonym to add to the ones already enumerated for this 
species, O. Menziesii Mitt. (Journ. Linn. Soc. 8: 25, 1865). 
VI. Group oF O. ARCTICUM. 
Five species in this group are known to occur in Greenland, and 
probably in Arctic America. They are characterized by a short . 
pyriform capsule, exserted on a short seta; teeth reflexed in pers, 
cilia 8, short triangular or rudimentary. None of the group had 
been reported from the United States, until Dr. Venturi recently 
described one. oe 
18. ORTHOTRICHUM PRMORSUM Vent. Bot. Cent. 44: 418 (1890)- 
'  Hedwigia, 32: 269, 282 (1893). ee 
Said to be closely allied to O. Caucasicum Vent. (Musc- Gall. 
176, ¢. 48, 1887). Characterized by its hygroscopic leaves and 
non-arctic habitat. ee ee 
