OF THE ATLANTIC ISLANDS. 9 
from that of L. tamariscina, but only in the non-development of 
those parts of the internal peristome which are present in that 
species, and that the group of Leskee with erect capsules and 
imperfect peristomes is precisely analogous to Pylaiesia and 
Homalothecium, Schimp.,— Pylaiesia having just the same position 
with regard to Stereodon cupressiformis, Brid., and Homalothecium 
to Hypnum rutabulum, Dill. In Hypnum hispidum and in L. 
prolixa the peristome is fully developed, and the habit approaches 
to that of Thuidium ; but the stems and branches are destitute of 
the phyllidia so general amongst Leskeoid mosses, and the cells of 
the leaves are but very slightly papillose. M. C. Müller places 
Hypnum hispidum by the side of H. fluviatile, Sw.; but the habit 
and capsule are different, and the substance of the leaves more 
rigid. Besides the H. hispidum, there is in New Zealand another 
species belonging to the same group, Leskea umbrosa, M.; but 
little can be said of its habit, for small specimens only have yet 
been seen. Hypnum nervosum, Hooker, and H. crispulum, Dzy. 
et Molk., appear to be possessed of the same habit, but are much 
less. In time other species may be discovered, which will either 
confirm the position of the group in Zeskea, or perhaps show them 
to be some modification of Hypnum with a dense areolation. 
HEPATICE. 
LEJEUNIA, Dumort. 
L. JoHNSONIANA, sp.nov. Caule repente vage ramoso, foliis diver- 
gentibus orbiculari-ovatis angulo parvo acutis, basi lobulo subsaccato 
inflexo oblongo apice bidentulo, amphigastris orbiculari-obovatis 
integerrimis, perianthio compresso obovato obtuso, ore parvo apicu- 
lato, utrinque ala dentata marginata, foliis involucralibus elliptico- 
oblongis apice paucidentatis, amphigastrio majore obtuso. 
Hab. Madeira, creeping on Madotheca Canariensis, Nees, Johnson, 1859. 
Whole plant brown, about the size of L. serpyllifolia, Lib., but 
agreeing in the form of its perianth with Z. (Phragmicoma) 
Mackaii, and thus removed from the vicinity of the species which 
are allied to Z. subfusca, Nees, with which it agrees in the form 
and substance of its leaves as well as in size and colour. 
EXPLANATION OF THE PLATES. 
PIATE I. 
Leskea spinosa. Plant, natural size ; leaf, magnified. 
Leskea prolixa. a, Plants, natural size. b, Leaf; c, perichstial leaf; d, cap- 
~ sule; e, portion of peristome : all magnified. 
Leskea setigera. Plant, natural size ; leaf, magnified. 
