MR. W. MITTEN ON NEW SPECIES OF MUSCI FROM CEYLON. 315 
same kind as those so prominent on the folds of the leaves of 
G. plicata. From the figure in ‘ Bryologia Javanica,’ t. 195, 
G. aristata in size and appearance resembles G. carinata; but 
the fructification is as represented in the same work, t. 196 (G. 
moluccensis). 
The internal peristome, as seen in old capsules, appears to 
exist only in a rudimentary state, aud is perhaps adherent to 
the teeth. 
PrEnoBRYUM, Hornsch. 
P. INVOLUTUM, Thw. et Mitt. 
Rami inferne nudi, superne in frondem subpinnatim ramosam divisi; 
folis patentibus ovali-oblongis brevi-apiculatis marginibus incurvis 
conniventibus integerrimis, nervo angusto infra apicem evanido, cellu- 
lis angustis, basalibus ad angulos densioribus aurantiacis areolatis; pe- 
richztia e ramo primario vel e ramulorum latere oriunda, foliis lon- 
gioribus convolutaceis erectis subulato-angustatis integerrimis; theca 
in pedunculo brevi cylindracea, operculo conico-rostrato ; peristomium 
breve, depressum, dentibus teneris pallidis, annulo lato cinctis ; calyptra 
dimidiata. 
Hab. Ins. Ceylon, prov. central., alt 4000'-6000', Dr. Thwaites. 
Rami fertiles biunciales, steriles elongati ramulis nonnullis filiformi- 
attenuatis. Folia lineam longa, stramineo-viridia, interdum fulves- 
centia, subnitida; sicca immutata.  Pedunculus bilinearis, fuscus. 
‘Theca fusca, pedunculo longitudine zqualis. 
This species, in habit and appearance, closely resembles P. 
convolutum (Dozy et Molk.), *Musc. Archip. Ind.’ t. 50 (Sym- 
physodon), and P. cylindraceum (Mont.), but is a little more 
robust; the foliage, in the incurvation of the margins of the 
leaves, resembles that of the first-named moss. The exserted 
capsule and dimidiate calyptra, so different from those of spe- 
cles otherwise closely related, may suffice for the placing of this 
species in a different section, which appears to be the most na- 
tural way of disposing of such differences. Many similar instances 
are presented amongst the mosses referred to the genus Neckera, 
the capsule being immersed in the perichetial leaves with a short 
calyptra, or exserted and having a longer calyptra decidedly 
split on one side. 
P. CEYLANICUM, Thw. et Mitt. 
Rami clongati, curvati, simplices vel parum divisi, ramulos angustos sto- 
loniformes hic illic emittentes ; folia patentia divergentiave, densius- 
cula, sed laxe imbricata, late ovalia obtusa et muer ne angusto subu- 
lato, excavata, valde concava, margine basi inflexo caulem amplexante, 
LINN. JOURN.— BOTANY, VOL. XIII, Z 
