18 
at least as a varietal name, but in carefully examining authentic 
specimens of Sullivant’s and Austin’s I found that when they were 
in their prime, with the capsules mature or just after sporosis, 
they agreed with O. Ohioense; when old and shriveled they agreed 
with O. citrinum. In fact, I found that both were mixed in the 
same patch, and as in all species of Orthotrichum the capsules are 
very different in different stages, so this seems to be only another 
instance of the elongation of the neck, and shrinking between the © 
ridges after sporosis. The teeth at first are united in pairs, but 
later become perforate and then divide. The mouth is bordered 
by irregular round cells, and the ridges are short, and narrow 
when the capsule is ripe and inflated, varying from 2-4 rows of 
cells ; the two inner are usually broader and more oblong than the 
two outer, though all four are usually bright yellow in the mature 
capsules, and only the two inner turn brown in the old wrinkled 
capsules. The stomata are very conspicuous in this species, 
owing to the projection of the cells which surround them and are 
usually about midway between the base of the spore-sac and the 
mouth. The calyptra and vaginule are hairy, the ochrea in the 
mature capsule is longer than the seta and clasps the broad base 
of the capsule, but with the elongation of the neck and seta it 
shrinks away. 
\ 
“ORTHOTRICHUM pPsILoTHECIUM C. M. & Kindb. Macoun’s Cat. 6, 
91 (1892). 
This species is founded on the slimmest of specimens accord- 
ing to the description, as the authors state that they “have not 
been able to examine the peristome nor the stomata of the capsule, 
because only one saben (in our specimens) is nearly ripe, the 
others quite unripe.” 
Now a species of Orthotrichum without the stomata described, 
nor the peristome, is worse than useless, as in this genus the leaves 
are almost alike in nearly all the species. 
We have been favored with a portion of the Rockcliffe speci- 
mens by Prof. Macoun, but have not seen the two others cited in 
the catalogue. The Rockcliffe specimens agree with the descrip- _ ae 
tion and are still immature as is stated, but we found two old 
capsules which prove them to be Orthotrichum strangulatum Sull. — 
beyond a gout. The setae 2 of the eee, would indicate 
