1900] MOSSES OF NORTH AMERICA 19 
part. The last character is the best, for the pedicel of G. sudsulcata is some- 
times néarly straight and the capsule without stomata, while the folds of the 
leaves are always distinct, especially on a transverse section. 
It is to be noticed that Limpricht cites erroneously G. /ame//osa C. Miill. 
as a synonym for G. a/pfestris: on the contrary, from an original specimen 
Miiller’s plant is proved identical with G. sudsu/cata. 
The true G. a/festris Schleich. has been gathered by Messrs. J. M. Holzin- 
ger and J. B. Blake in the same region of northwestern Montana where they 
have collected G. subsulcata, 
Orthotrichum Idahense Card. & Thér., sp. nova.— Monoicum, 
laxe depresso-pulvinatum, inferne fuscum, superne lutescenti- 
viride. Caulis basi decumbens, longe denudatus, irregulariter 
ramosus, 2—3™ longus, ramis ascendentibus. Folia madida 
erecto-patentia, sicca erecto-appressa, 1.75—2.50™™ longa, 0.50- 
0.75 lata, oblongo-lanceolata, subobtusa, integra, marginibus fere 
e basi usque infra apicem arcte lateque revolutis, costa sub- 
percurrente; cellulae ubique  unistratosae, parietibus valde 
incrassatis, inferiores rectangulares, juxta costam lineares, mar- 
gines versus quadratae vel breviter oblongae, caeterae rotundae, 
utraque pagina papillis grossis bi-trifurcatis obsitae. Folia peri- 
chaetialia subconformia, basi laxius reticulata. Vaginula nuda. 
Capsula in pedicello brevissimo vix emersa vel semi-emersa, 
madida ovata, collo brevi attenuata, sicca subcylindrica, infra os 
leniter constricta, octostriata, striis e cellulis 4-seriatis, longiori- 
bus, lutescentibus, parietibus crassioribus compositis, stomatibus 
emersis. Operculum ignotum. Peristomii dentes 8 bigeminati, 
vel 16, siccitate reflexi, plus minus pertusi, minute granulosi, 
superne lineolati; cilia nulla vel fugacia. Calyptra lutescens, 
apice fusca, ramentis longis, numerosis, denticulatis, papillosis 
obsita. Sporae papillosae, 20-22 crassae. Flores masculi ses- 
siles.— Plate V. 
ae Moscow mountains, on rocks (L. F. Henderson, 1893). 
the superficial stomata and the peristome reflexed when dry and 
ea Sepaica: this species belongs to the group of O, arcticum Sch., but 
is easily distinguished from all the other species of this group by its lax tufts, 
emergent capsule, and peristomial teeth less opaque, covered with less dense 
papillae. 
