Or THE FORTY-MNTH PARALLEL OF LATITUDE. 37 



H. STRIGOSUM, Hoffm. 



Hab. Rocky Mountains, Bourgeau ; Fort Colville and Galton Moun- 

 tains, Lyall. 



Pterogoistum, Sic. 



P. brachypterum, sp. nov. Monoicum, caule procumbente inordi- 

 nate pinnato ramis abbreviatis, foliis imbricatis densis late deltoideo- 

 ovatis acuminatis (acumine angusto) coneavis, margine inferne 

 piano superne minute subserrulato, nervo concolore paulo ultra me- 

 dium evauido, cellulis ad augulos minutis rotundis, reliquis brevi- 

 ovoideis in apiculi apice elongatis, omnibus distinctis papillosis, peri- 

 chaetialibus erectis ovatis acuminatis nervo supra medium desinente 

 integerrimis, cellulis elongatis areolatis teneris, theca in pedunculo 

 elongato crassiusculo flavo ovali-cylindracea erecta gequali, operculo 

 brevi conico, peristomio externo dentibus brevibus flavis infra os 

 thecae 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. abbreviation, (ZesJcea) Schimp. Quite distinct from any other 

 North American moss. 



(Heterocladium, Schimp.) 

 P. procurrexs. Dioicum, caule arcuato procumbente ramis inordi- 

 natis pinnato bipiunatove, foliis caulinis divergentibus compressis cor- 

 dato-ovatis sensim in acumen piliforme attenuatis marginibus tenuiter 

 serrulatis nervis binis inaequalibus medio evanidis, cellulis in folii 

 medio elongatis margines apicemque versus oblongis, omnibus pellu- 

 cidis laevibus, rameis ovatis asymmetricis apicibus obtusiusculis, peri- 

 chaetialibus 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. 

 dimorjphum, Brid., and H. JCurrii, Sch., but agrees with them in all 

 essential characters. It is the largest of all the species yet known. 



Hxlocomtum, Schimp. 



H. TRIQUETRUM, LillJl. 



Hab. British Columbia, Lyall and Douglas ; Juan de Fuca, Seemann. 



H. loreum, Dill. 



Hab. Vancouver Island, Lyall and Wood', British Columbia, Lyall', 

 N.W, Coast, Barclay ; Juan de Fuca, Seemann. * 



