OP THE FORTY-NINTH PARALLEL OF LATITUDE. 33 



H. declivum, sp. nov. Monoicum, caule procumbente subpinnato, 

 foliis subfalcatis lanceolatis sensim acuminatis, nervo medio evanido, 

 marginibus serrulatis, cellulis omnibus elongatis angustis, perichaeti- 

 alibus e basi latiore recurvis enerviis, theca in pedunculo crassius- 

 culo scaberrimo horizontal! ovali inaequali, operculo conico, peristomio 

 normali ciliis duobus appendiculatis 



Hab. Pend Oreille River, on Peltigera scutata and P. venosa, Lyall. 



A small, slender species, so nearly allied to H. velutinum, Dill., 

 that it might be considered merely a variety, were it not for the 

 very much thicker and more scabrous seta and the capsule, when 

 old, pendulous. 



H. acutum, sp. nov. Monoicum, caule procumbente vage subpinnato, 

 foliis patentibus compressis ovato-lanceolatis sensim a basi ad apicem 

 acutum angustatis siccitate longitudinaliter plicatis, nervo paulo ultra 

 medium evanido, marginibus superne remote serrulatis, cellulis basi 

 brevibus oblongis inde ad apicem elongatis angustis, perichaetialibus 

 e basi erecta ovali brevi nervata subulatis angustis subintegerrimis 

 recurvis, theca in pedunculo elongato ovali inclinata inaequali, operculo 

 conico brevi subulirostrato, peristomio normali. 

 Hab. Pack River, British Columbia, Lyall. Sent also from Boston by 



Green. 

 In size and general appearance very closely resembling some of 

 the less robust states of H. salebrosum, but differing from this and 

 nearly all the allied species in the form of its leaves gradually 

 narrowed from just above the base to the apex and not acumi- 

 nate, and in the operculum. In the compressed foliage and 

 spreading habit not very dissimilar to some states of H. ripariwn, 

 Dill. 



H. asperrimum, sp. nov. Dioicum, caule procumbente ramis laxe 

 subpinnatim ramosis, foliis ovatis sensim acuminatis striatis, nervo 

 ultra medium evanido dorso denticulato, marginibus serrulatis basi 

 anguste decurrentibus, cellulis ad angulos paucis brevioribus, superi- 

 oribus elongatis angustissimis, perichaetialibus e basi ovata subulato- 

 attenuatis recurvis breviter nervatis, theca in pedunculo elongato 

 asperrimo inclinata ovali, operculo conico acuminato, peristomio nor- 

 mali. 



Hab. British Columbia, Lyall and Douglas. 



A little more slender than the usual forms of H. rutabulum, Dill., 

 and with leaves gradually narrowed to the apex, not contracted at 

 the top of the ovate portion of the leaf, thence acuminate, the 

 margins more strongly serrulate, and the nerve distinctly denticu- 

 late towards its apex. 



LINN. PROC. — BOTANY, YOL. VIII. D 



