Musci Exorici.—Gardneriant. 
DIDYMODON SQUARROSUM. 
Didymodon caule elongato flexuoso, ramoso, foliis undi- 
que patentibus squarrosis longe lanceolatis flexuosis 
carinatis serratis, seta elongata, capsula cylindracea, 
operculo longe subulato. (Tas, CL.) 
Has. In Nepal. Hon. D. Gardner. 
Caules digitales et ultra, cespites magnos densos efformantes, 
erecti, flexuosi, dichotome ramosi. Folia undique inserta, pa- 
tentia vel etiam recurva, et ita squarrosa, flavo-viridia, longe 
lanceolata, carinata, flexuosa, submarginata, inferne precipue, 
superne serrata, nervo ad apicem attingente percursa; szb- 
stantia tenera, compacta tamen, areolis minutissimis. Peri- 
chetialia reliquis similia sed magis elongata et sete basin am- 
plexantia, erecta. Seta terminalis, uncialis et ultra, flava. 
Capsula cylindracea flavo-fusca, Calyptra dimidiata. Oper- 
culum longe rostratum flavum, basi rufum. Peristomium e 
dentibus 32, setaceis, per paria arcte approximatis pallide 
lla 
This fine moss has the greatest resemblance in its leaves and 
fructification to a very rare and minute one of our own country, 
Didymodon flexifolium. ft has a similar. perichetium, and the 
leaves are in like manner flexuose ; but then these latter are in 
our present plant of a long lanceolate figure, gradually tapering 
to a point, whilst those of D. Jlexifolium are ovate and obtuse. 
D. squarrosum has certainly more the character of a Tricho- 
stomum than of a Didymodon; but to this last genus it assu- 
redly belongs, havitig a truly dimidiate calyptra. 
Fig. 1, plants, nat. size. Fig. 2, portion of a stem with the 
perichetium. Fig. 3, leaf, Fig. 4, apex of ditto. Fig. 5. ca- 
lyptra. Fig. 6, capsule, Fig. 7, peristome. Fig. 8, portion 
of ditto.—magn, 
