156 MR. W, MITTEN ON MUSCI AND HEPATIC 
in rameis interdum sub apice evanido, perichztialibus parvis ovatis 
acuminatis, theca in pedunculo pallide fusco apice sublzvi ovali ellip- 
tica in collum sensim angustata, peristomio normali. 
Hab. Nagasaki, Japan, Oldham. 
In size, colour, and appearance very closely resembling H. 
Tibetanum, Mitten, Musci Ind. Or.; but it differs from that species 
in its more regularly ovate leaves with longer nerves, and cells 
only half as large; the form of the capsule appears also to be 
different, it having with the thickened neck an elliptical outline, 
and when dry it is very much shrivelled up. The capsule of H. 
Tibetanum is more ventricose at the base and somewhat ovate in 
its form, not gradually attenuated into the neck, and retains the 
same form when dry. 
POLYTRICHACEE, Mitten. 
Poconatum, Brid. 
P. sPINULOSUM, sp. nov. Caule brevissimo, foliis e basi erectiore la- 
tiore subulatis breviter oblongo-lanceolatis incurvis, nervo crassiusculo 
pereurrente superne dorso dentibus cristato, marginibus e basi ad 
apicem dense spinuloso-dentatis, perichzetialibus erectis elongatis con- 
volutis oblongo-lanceolatis acutis apice marginibus dorsoque denticu- 
latis, theca in pedunculo elongato subeylindracea inzequali suberecta 
inclinatave, operculo convexo breviter curvirostrato, calyptra tomen- 
tosa thecam totam obtegente. 
Hab. On the earth, Nagasaki, Japan, Oldham, 
Nearest to P. Gardneri, C. Müller, but larger than Gardner's 
specimens, and differing from it and P. Pennsylvanicum, Hedw., 
in its perichetial leaves being more elongated, but with shorter 
points, and in the much more dentate lower leaves. 
P. aloides, Hedw., has been gathered in Japan by Mr. Oldham, 
and in China by Mr. Fortune and Mr. Alexander. 
HEPATIC. 
SOLENOSTOMA, Mitten. 
Plectocolea, subgen. nov. 
Perianthium terminale, tuhulosum, plicatum, ore denticulatum. 
Caulis ascendens. Folia explanata, disticha, pagina inferiore 
radicellis villosa. Amphigastria parva obsoletave. 
S. RADICELLOSUM, sp. nov.  Caule procumbente subsimplici crassius- 
culo, radicellis pallidis foliis adhzrentibus, foliis subverticalibus sub- 
orbiculatis oblatisve patulis concavis, margine ventrali recurvis, dor- 
