2735
DIDYMODON brachydontius.
Short-toothed Didymodon.
CR YPTOGAMIA Musci.
Gen. Char. Fruit-stalk terminal. Peristome single,
of 32 teeth in pairs. Calyptra dimidiate.
Spec. Char. Stems short, scarcely branched. Leaves
widely spreading, linear, with plane margins,
bluntish, entire; nerve excurrent, slightly recurved
towards the apex. Capsule oblong-ovate,
erect; lid rostrate. Peristome very short.
Syn. Trichostomum brachydontium. Bruch in Unio
Itineraria.
Weissia brachydontia. Hooker’s MSS.
W. fallax or deficiens. Wils. MSS.
G a t h e r e d , in June 1828, on the grassy limestone de.
clivities of Tros y Marian, on the north coast of Anglesey.
Stems tufted. Leaves of equal width throughout, and
truly linear, often slightly undulated, light green, with a
semi-pellucid nerve, not channelled, but nearly flat, curled
when dry; in a moist state widely spreading and somewhat
recurved. Teeth of the peristome almost obsolete ; so that
its generic station can only be estimated by its close affinity
to Didymodon crispulus, and to a third species, distinguished
by Bruch under the name of Trichostomum jlexisetum, not
yet observed in Britain. As the discrepancies between these
three species may not be sufficiently obvious or satisfactory
to all botanists, we have chosen to retain them in juxtaposition,
instead of ranking this Moss among the Weissia,
until its characters have been more fully investigated and
established.—W . W .