MR. W. MITTEN ON NEW SPECIES OF MUSCI FROM CEYLON. 301 
Leiostoma, Mitt. Musc. Austr. Amer. 194. 
M. RAMENTOSUM, Thw. et Mitt. 
Rami crassiusculi, ramosi ; folia patentia, elongate lanceolata, apice lati- 
uscula acuta, nervo in apiculum brevem excurrente carinata, integer- 
rima, cellulis superioribus minutis rotundis distinctis, inferioribus 
basin versus oblongis elongatisque angustissimis, intus parce papilli- 
feris, basalibus ad nervum precipue uno latere majoribus oblongis di- 
latatis pellucidis ; pericheetialia vix breviora, subovata acuta; theca in 
peduneulo breviusculo ovata, plicata, operculo acuminato rostrato ; 
peristomii dentes truncati, geminati; calyptra infra basin thecz de- 
scendens, ramentis flavis rufisve obtecta. 
Hab. Ins. Ceylon. Dr. Thwaites. 
Rami 3-1 unciam alti. Folia bilinearia, apicalia viridia, inferiora fus- 
cescentia, omnia subnitida, siccitate laxe crispato-contorta. Pedun- 
culus 4 lineas longus. Calyptra straminea, fulvescens. 
In size and appearance like M. sulcatum (Hook.), but with 
leaves narrowed above their middle. 
M. CONTORTUM, Thw. et Mitt. 
Rami abbreviati; folia densa, patentia, sicca in spiram apice acutam con- 
torta, subovato-lanceolata obtusa, nervo in mucronem pungentem ex- 
currente carinata, margine inferne uno latere recurvo, integerrima, 
cellulis inferioribus pellucidis fere ad folii longitudinis medium usque 
ascendentibus, basalibus oblongis, sensim superne abbreviatis rotundis, 
supra foli medium rotundatis obscuris; perichztialia «equilonga, 
ovata sensim acuminata; theca in peduneulo angulato, breviter ovalis, 
levis, sicca sub ore rotundo contracta, operculo conico rostrato; peri- 
stomium membrana brevissima indivisa; calyptra nuda. 
Hab. Ins. Ceylon. Dr. Thwaites. 
Rami bilineares. Folia juniora viridia, seniora fusca, longitudine lineam 
dimidiam parum excedentia, tenaci-nervia, difficillime a caule sepa- 
randa. Pedunculus quadrilinearis, ruber. 
Allied to M. Blumei, Nees ab E., and to M. concinnum, Mitt. 
Bry. Javan. t. 110, but with the nerve of the leaf more excurrent. 
M. hispidulum and M. seminudum, together with M. angulatum 
(Mitt. Linn. Soe. Journ. vol. x. p. 167) and the species named by 
Nees von Esenbeck JM. orthostichum, as well as a few others, form 
a small group which does not very closely approach any other sec- 
tion of the extensive genus Dacromitrium. In habit, these spe- 
cies resemble some of those like AL gracile, which belong to the 
section with curved cells in the lower part of the leaf; but the areo- 
lation of the leaves is very different, the narrow cells being nearly 
or quite absent. The following is an outline of this division :— 
x2 
