departing from the character proper to the genus, which is
not easily kept separate from TVeissia.
The keeled leaves and short operculum easily distinguish
this species from Grimmia unicolor, which we shall next
describe.—W. W.
2771. (Fig. 2.)
GRIMMI A unicolor.
Dark rigid Grimmia.
CRYPTOGAMIA Musci.
Gen. Char. Fruitstalk terminal. Peristome simple,
of 16 entire or perforated, rarely cleft, equidistant
teeth. Calyptra mitriform.
Spec. Char. Stems branched. Leaves erecto-patent,
lanceolate-subulate, very obtuse, rigid, the broad
nerve reaching to the apex. Capsule ovate.
Lid conical, rostrate.
Syn. Grimmia unicolor. Grev. Scot. Crypt. FI. 1.123.
Hook. 8ç Tayl. Muse. Brit. ed. 2. 72. Brid.
Bryol. Univ. v. 1.182. Hook. Engl. Fl.v. 5.27.
r IGURED from specimens gathered by Mr. Thomas
Drummond on rocks above Bach-na-gairn, Clova, and kindly
communicated by G. A. W. Arnott, Esq.
Stems clustered, about two inches long. Leaves nearly
erect, less spreading and much narrower than those of the
last species, rounded at the back, dilated towards the base,
the upper part almost linear and entirely occupied by the
broad thick nerve, rounded and very obtuse at the apex,
the margin entire and slightly indexed, so that the leaf
becomes slightly channeled on the upper surface. Fruit-
stalk very short, not rising much beyond the leaves. Capsule
ovate, nearly erect, smooth. Peristome red, incurved.
Lid half as long as the capsule. We have not seen the calyptra
: it is said by Dr. Hooker to be “ at first truly mitriform,
afterwards bursting on one side by the enlargement of the