150 
Type locality, British America ; Drummond, also reported with 
a? from San Marcos, Texas, Wright. A note in Sullivant’s her- 
barium states: “ That the parcel with Wright’s specimens has two 
forms, one referable by its foliage to O. diaphanum, the other 
appears to be O. canum, Mitten?’ It seems probable that all of 
Wright’s Texan specimens are O. diaphanum, and that O. canum 
is too close to be a good species.. That O. diaphanumis a variable 
species is shown by the three described varieties cited by Lim- 
pricht, one of which has a naked calyptra, and another sparsely 
hairy; the third is an aquatic form. 
Lt. Group OF O. RIVULARE. 
Plants more or less aquatic, dark green. Leaves blunt, vein 
ending below the apex, capsule immersed, 8-ribbed, teeth united 
in pairs and reflexed when dry, cilia 16, calyptra smooth. 
25. ORTHOTRICHUM RIVULARE Turn. 
Type European. Venturi says “it seems abundant in North 
America, where the upper leaves are more frequently denticulate 
at the point.” It seems to be confined to the Pacific Slope, hav- 
ing been found only in California, Oregon and Washington (Suks- 
dorf). 
26. ORTHOTRICHUM SpRUCEI Mont. 
A very rare species, known from only a few stations in France 
and Belgium, besides the British localities. 
It has recently been determined by Dr. Venturi as No. 208, 
collected by J. B. Leiberg “on Willows overhanging in the old 
Channel of Clark's Fork of the Columbia River, evidently sub- s 
merged during high water. Only a few specimens found, 5eP" 
tember 14, 1889.” ae: 
Philibert records a hybrid between O. Sprucei and O. die | 
phanum. (Rev. Bryol. 10: 8, 1883), also on periodically sub- wae 
mersed willows near Bruailles, France. 
27. ORTHOTRICHUM EURYPHYLLUM Vent. Bot. Cent. 44: 417 (1899) 
Hedwigia 32: 268, 281 (1893). a 
Dr. Venturi remarks that this species may also possibly Lad os 
hybrid, as it unites the characters of two groups, having the leaf 
form and peculiar strong cilia of O. rivulare, and the form of the 
capsule and peristome of O. cupulatum. | ae 
