OF THE FORTY-NINTH PARALLEL OF LATITUDE. 37 
H. stricosum, Hoffm. 
Hab. Rocky Mountains, Bourgeau; Fort Colville and Galton Moun- 
tains, Lyall. 
PTEROGONIUM, Sw. 
P. BRACHYPTERUM, sp. nov. Monoicum, caule procumbente inordi- 
nate pinnato ramis abbreviatis, foliis imbricatis densis late deltoideo- ` 
ovatis acuminatis (acumine angusto) concavis, margine inferne 
plano superne minute subserrulato, nervo concolore paulo ultra me- 
dium evanido, cellulis ad angulos minutis rotundis, reliquis brevi- 
ovoideis in apiculi apice elongatis, omnibus distinctis papillosis, peri- 
chetialibus erectis ovatis acuminatis nervo supra medium desinente 
integerrimis, cellulis elongatis areolatis teneris, theca in pedunculo 
elongato crassiusculo flavo ovali-cylindracea erecta zquali, operculo 
brevi conico, peristomio externo dentibus brevibus flavis infra os 
thecz orientibus basi coalitis, interno carente, flore masculo gemmi- 
formi majusculo. 
Hab. British North America, Drummond. 
Stems about one inch long. Seta half an inch high. In struc- 
ture and appearance corresponding closely with the Abyssinian 
P. abbreviatum, (Leskea) Schimp. Quite distinct from any other 
North American moss. 
(Heterocladium, Schimp.) 
P. PROCURRENS. Dioicum, caule arcuato procumbente ramis inordi- 
natis pinnato bipinnatove, foliis caulinis divergentibus compressis cor- 
dato-ovatis sensim in acumen piliforme attenuatis marginibus tenuiter 
serrulatis nervis binis inzqualibus medio evanidis, cellulis in folii 
medio elongatis margines apicemque versus oblongis, omnibus pellu- 
cidis levibus, rameis ovatis asymmetricis apicibus obtusiusculis, peri- 
chetialibus e basi late ovata convoluta apicibus patentibus, theca in 
pedunculo elongato ovali horizontali. 
Hab. British N. America, Drummond. 
Dull yellowish green. Stems three inches or more long, with 
branches varying from half to one inch in length. Seta one inch 
long. This species has a looser habit than the European H. 
dimorphum, Brid., and H. Kurrii, Sch., but agrees with them in all 
essential characters. It is the largest of all the species yet known. 
Hytocomtum, Schimp. 
H. TRIQUETRUM, Linn. 
Hab. British Columbia, Lyall and Douglas; Juan de Fuca, Seemann, 
H. LonEUM, Dill. 
Hab. Vancouver Island, Lyall and Wood; British Columbia, Lyall ; 
N.W. Coast, Barclay ; Juan de Fuca, Seemann. , 
