1909] Andrews,— Bryophytes of Mt. Greylock Region,— IV 117 
Where the fall of such brooks is greatest, in this case not far below 
their source, one may depend upon finding certain species of brvo- 
phytes not likely to be met with elsewhere on the mountain surface. 
The species not listed before are: 
Mvsctr. 
Andreaea petrophila Ehrh. Covering a boulder in brook-bed, 
higher altitude. I have been unable to demonstrate the occurrence 
of this genus elsewhere on the mountain. 
Brachythecium rutabulum (L.) B. & S. Wet bank by brook, lower 
altitude in Hopper. 
Didymodon  rigidulus Hedw. (Barbula rigidula Mitten). On 
rocks in Hopper. This species appears to be very uncommon in the 
eastern United States and I was for that reason inclined to regard my 
specimens as Barbula gracilis (Schleich.) Schwaegr., which is not dis- 
similar, and according to Dixon ! may show similar brood-bodies in 
the axils of the upper leaves. Dr. G. N. Best, to whom I sent a 
specimen, calls my attention to the fact that the leaf-costa is not ex- 
current in the upper leaves as in В. gracilis and names it as above. 
Fissidens minutulus Sulliv. Оп rocks (schist) of brook-beds, 
higher altitudes. 
Homalia Jamesi: Schimp. In crevices of rocks by brook-beds, 
higher altitude. 
Hypnum montanum Wils. Rock of brook-bed, higher altitude. 
Fruited. Dr. Best kindly confirmed my identification of this un- 
common and beautiful moss. 
H ypnum. stellatum Schreb. In wet place at base of mountain in 
Hopper. 
Leskea nervosa (Schwaegr.) Myrin. On stump by carriage-road, 
higher altitude. К 
Mnium spinulosum В. & S. On decaying logs at middle altitude. 
Capsules not aggregated. 
HEPATICAE. 
Cephalozia bicuspidata (L.) Dumort. From decaying log by brook 
higher altitude. 
1Student’s Handbook of British Mosses? p. 217. 
