2?7i. (Fig. L)
GRIMMI A atrata.
Dark-coloured, Grimmia.
CRYPTOGAMIA Musci.
G e n . C h a r . Fruitstalk terminal. Peristome simple,,
of 16 entire or perforated, rarely cleft, equidistant
teeth. Calyptra mitriform.
S p e c . C h a r . Stems sparingly branched. Leaves
erecto-patent, lanceolate-subulate, keeled, blunt-
ish, nerved almost to the apex. Capsule elliptic-
oblong. Lid conical, obtuse, subrostrate.
S y n . Grimmia atrata. Hook. Muse. Exot.t. 100. Brid.
Bryol. Univ. v. 1. 184. Hook. Engl. FI. v. 5. 27.
.^V.N alpine species, found in August 1828, near the summit
of Snowdon, by Mr. Wilson. It is also understood to
have been found in Glen Callater, by Dr. Greville.
Stems clustered, an inch long and upwards. Leaves dark
green, almost black when old, imbricated, moderately spreading,
somewhat twisted round the stem after having been
dried, channeled and keeled, the margin entire and slightly
thickened, the nerve certainly vanishing below the apex,
which is angular, not rounded as in the next species. Fruit-
stalk thick, straight, not twisted, a quarter of an inch long.
Capsule nearly erect. Teeth of the peristome reddish (yellowish
according to Muse. Exot.), incurved. Operculum
very obtuse, obscurely beaked, about one fourth of the length
of the capsule. Calyptra in all our specimens dimidiate,