11 
original specimens, recently seen in the Sullivant herbarium. The 
Icones cites them as growing on rocks. We sent a portion of 149 
to M. Philibert and he says they agree with European specimens 
of O. alpestre in his collection. Specimens collected by R. S. 
Williams, No. 96 and distributed O. alpestre var. majus, grew on 
rocks, in the Belt Mountains, Montana, and were sent to Venturi 
for comparison, He says they are O. adpestre, and the most ex- 
treme form he has seen in its differences from O. stramineum, to 
which O. alpestre is closely allied. 
Noticing that Limpricht cites the locality of this species as on 
trees and QO. alpestre on rocks, we tried to refer No. 149 to the 
former, but we could not find any intermediate cilia. 
It will be seen, therefore, that both O. Canadense and 
O. alpestre, var. Sull., stand on very uncertain foundations, and 
require more study to settle the question of their value. 0. 
Canadense, especially, based on two numbers of exsiccate, 
which are more or less mixed and imperfect, with such a 
meagre description, can*hardly be said to be a well established 
species. Prof. Macoun’s specimens of No. 151 do not show any 
intermediate ridges and do not agree exactly with the Kew speci- 
mens or with 149; the capsules are older than 149, are less 
strangulate, and the peristome is gone, so that they do not help us 
to solve the riddle, and only complicate the question of what is O. 
Canadense ? 
We have received specimens from Prof. Macoun which agree 
with 149, but he is uncertain whether he collected them on rocks 
or trees. They are mixed with Grimmia apocarpa, but the label 
Says on trees near Ottawa. It will be noted that No. 149 of Drum- 
mond’s mosses is cited in the Catalogue as No. 338, O. alpestre, 
(p. 88), and again with 151 as No. 361 O. Canadense (p. 92). 
Mr. Wright informs me that there are specimens at Kew, collected 
by Prof. Macoun on trees along the Moira at Belleville in 1865, — 
labelled O. Canadense by Mitten. 
OrTHOTRICHUM TENELLUM Bruch, Brid. Bryol. Univ. 1: 786 (1826). 
Specimens collected on trees by J. Dearness, near Ottowa, in i —s 
May, 1889, are credited to this species in Macoun's catalogue — 
| (6, 90). I have seen the specimens and compared them critically 
With European descriptions and exsiccate. They are not 0. 
