32 MR. W. MITTEN—BRYOLOGIA OF THE SURVEY 
mixed with a fertile state of H. uncinatam, this species would 
appear to be a little larger than that found in the mountains of 
Switzerland and distributed by Schleicher as Pterogonium stri- 
atum, and since named by De Notaris Lescurea insignis ; but in this 
the leaves are more concave. 
The relative position of the species constituting the group known 
as Lescurea, Schimper, to Ptychodium ejusd. is precisely the same 
as that of Pylaiesia, Schimp., to Hypnum cupressiforme and of 
Homalothecium to Camptothecium and Brachythecium, the sum of 
the differences being only in a more erect capsule and less perfect 
peristome—distinetions whieh may serve for the arrangement of 
the species, but can scarcely be admitted as of generic importance 
when considered by the light afforded by the very natural group 
Plagiothecium and Amblystegium, Schimp., and also by the modi- 
fications in the peristome of Bryum. 
All the yet described species of Lescurea and Ptychodium agree 
in the substance of the leaves and in the presence of paraphylla. 
(Brachythecium, Schimp.) 
H. ALBICANS, Neck. 
Hab. Rocky Mountains, Bourgeau. 
H. sALEBROSUM, Hoffm. 
Hab. Saskatchewan, Bourgeau ; Fort Colville and Pend Oreille River, 
Lyall. 
H. coLLINUM, Schleich. 
Hab. Cascade Mountains, British Columbia, Lyall; collected also in 
British N. America by Drummond. 
H. ŒDIPODIUM, sp. nov. Monoicum, caule procumbente subpinnato 
ramis decurvis radicantibus, foliis late ovatis acuminatis, nervo medio 
evanido, marginibus serrulatis, cellulis oblongis elongatisque ad an- 
gulos decurrentibus pluribus quadratis, perichætialibus convolutis 
late ellipticis acuminatis apice serrulatis enerviis, theca in pedunculo 
crassiusculo sulcato minute scabro nutante ovali inæquali, operculo 
conico, peristomio normali ciliis duobus appendiculatis. 
Hab. Lake Huron, Todd, and sent from the United States by Cooley ; 
Pack River and Rocky Mountains, Lyall. 
Stems loosly cæspitose. Leaves pale green and subeompressed, 
those of the ramuli more sharply serrulate; areolation soft and 
loose; cells generally chlorophyllose. In appearance this species 
has some resemblance to H. Starkii, and agrees with it in its thick 
seta and the appearance of the capsule; but the substance of the 
leaves is far different, and in drying they do not become striated. | 
D ——— 
