OF THE FORTY-NINTH PARALLEL OF LATITUDE. 85 
leaves are much wider in proportion to their length, and loosely 
imbricated, so that the stems have a more terete appearance ; the 
papille on the back of the leaves seem to be absent; the areolation 
agrees entirely with that of the preceding species, but the cells in 
the angles are more bossed out and coloured. 
This may be H. (Isothecium) Brewerianum, Lesq., but its de- 
scription’ is not sufficiently complete to be quite certain. 
H. AGGREGATUM, sp. nov. Dioicum, caule primario repente, ramis 
erectis densissime aggregatis simplicibus parceve ramosis curvatis 
attenuatis, foliis inferioribus patentibus late hastato-ovatis acuminatis 
subenerviis sensim versus medium ramorum in late ovata, ultra 
medium nervata acuminata subjulacea imbrieata transeuntibus, inde 
sensim minoribus argutiusque versus apicem serrulatis, nervo dorso 
apice dentiformi prominente, cellulis ad angulos pluribus minutis 
quadrato-rotundatis, superioribus brevibus oblongis pellucidis, perichæ- 
tialibus elongatis ovato-lanceolatis seminerviis apicibus serrulatis 
patulis, theca in pedunculo circiter semiunciali levi inclinata cylin- 
dracea inzquali, operculo conico acuminato, peristomio interno pro- 
cessibus angustis, ciliis singulis dimidio brevioribus interpositis, in 
membrana ad dentium tertiam longitudinis exserta. 
Hab. Vancouver Island, Lyall; British Columbia, Douglas. 
Slightly glossy, pale green tinged with brown, growing in dense 
patches, with the erect stems closely packed together. The leaves, 
from their julaceous imbrication, give the smaller plants some 
resemblance to some states of Pterogonium gracile, but they are 
generaly much thicker and shorter. Other stems with less 
imbricated leaves have a resemblance to H. myurum, with which 
the habit of the plant agrees. 
H. APLOCLADUM, sp.nov. Dioicum, caule procumbente apice descen- 
dente radicante ramis paucis subsimplicibus apicibus sæpe attenuatis 
decurvatis, foliis patentibus, in ramorum apicibus cuspidato-imbricatis, 
ovatis acutis nervo sub apice evanido integerrimis, in ramulis apicibus 
latioribus obtusioribus serrulatis, cellulis basi ad angulos pluribus 
quadrato-rotundatis subobscuris, superioribus oblongis parietibus te- 
neris, perichetialibus elongatis erectis ovato-lanceolatis acuminatis 
apice serrulatis ultra medium nervatis, theca in pedunculo elongato 
sublevi erecta suberectave ovali cylindracea, operculo convexo acu- 
minato. 
Hab. N.W. coast of America, Douglas. 
In appearance not unlike some specimens of H. acuminatum, 
Beauv. ; but the leaves are quite smooth, and the habit would ap- 
pear to be different. The seta is very slightly rough, so slightly 
that its roughness is only seen when specially sought for. The 
peristome is broken in all the capsules. 
n 2 
