8 MR. W. MITTEN ON THE CRYPTOGAMIC FLORA 
cellulis parvis ovalibus inter se remotiusculis levibus, perichztiali- 
bus elongatis erectis late lanceolatis acuminatis superne serrulatis, 
nervo in apice evanido, theca in pedunculo gracili subunciali rubro 
apice curvato breviter ovali equali, collo nullo, operculo conico acu- 
minato, peristomio dentibus luteis subulatis, processibus subzequilon- 
gis carinatis perforatis, ciliis tribus appendiculatis interpositis in mem- 
brana ad } dentium longitudinis exserta. 
Hab. Madeira, near Funchal, 1857, Johnson. 
Habit similar to the preceding, but not so rigid nor of so dull 
a green colour. Ramification less stiff; and some branches are 
produced as if they had grown in a subpendulous manner. The 
leaves are not subulate; the nerve wider, and vanishing consi- 
derably below the apex. 
L. SETIGERA, sp. nov.  Habitu L. spinose, foliis patenti-secundis ova- 
tis concavis, marginibus minute crenulatis, nervo crasso compresso 
viridi excurrente folii longitudinem triplo superante levi, cellulis par- 
vis ovoideis basi paucis longioribus. 
Hab. Madeira, 1862, Johnson. 
In aspect entirely similar to Z. spinosa, but in the few stems yet 
seen less distinctly pinnate, although forming the same tree-like 
branches. The great length of the firm and stout green nerve is 
remarkable. 
The species composing this group, and including the Hypnum 
hispidum, Hook. f. et Wils., are here placed as a section of Leskea, 
that being the oldest name under which certain species having the 
strueture and habit of L. polycarpa, Ehrh., were distinguished from 
Hypnum, and, like most of the earlier genera, established upon peri- 
stomial characters only. But with an extensive series of species 
it becomes evident that the most perfect form known amongst the 
mosses having the same areolation and mode of growth is found 
in Z. tamariscina (Thuidium, Schimper), notwithstanding the ap- 
parently different habit and ramification; for in this species the 
peristome has the same development as in the most complete 
forms of Hypnum and Bryum ; and diverse as L. polycarpa looks in 
imperfect specimens, when examined in favourable situations it is 
found to produce occasionally free stems which in ramification and 
appearance closely resemble Z. abietina (Thuidium, Schimp.) ; and 
from this last species the transition into the more branched forms 
is so easy when even the allied European species are compared, 
that M. Schimper has not ventured to separate it from his Phuti- 
dium. And as to the peristome of Leskea, taking for example again 
L. polycarpa, it will be observed that it does not differ in structure 
