2925.
GYMN0MITR1UM adustum.
Brown Gymnomitrium.
CRYPTOGAMIA Hepatic#.
Gen. Char. Fruit terminal. Perianth none except
the convolute involucral leaves. Calyptra immersed
in the involucre.
Spec. Char. Stipules none. Stems very short, creeping
at the base ; branches ascending, subclavate,
, terete, straight. Leaves ovate, closely imbricate,
edges not scarious, apex bifid.
Syn. Gymnomitrium adustum. Nees ab Esenb.
<e Europ. Leberm.” Synops. Hepat. 3.
“ Acolea brevissima. Dumort. Syll. 76. n. 109.”
“ Jungermannia concinnata (3. minor. Schleich.
Cat. Exsicc. a. 1821.”
CjTATHERED in March 1847, from sandstones in a ravine
in Blackdown, Sussex, above the Rundhurst farm-house. It
was discovered there, as long ago as 1839, by Mr. E. Jenner,
who at the time referred it very doubtfully to Gymnomitrium
concinnatum (the Jungermannia concinnata of authors, Engl.
Bot. '2229), and was afterwards led to regard it as a small
variety of Sarcoscyphus Ehrharti (Jungermannia, emarginata,
Engl. Bot. 1022), but it is doubtless distinct, and the species
named by Nees as above.
The stems of this minute species are closely crowded into
small even patches of a dark brown colour. The leaves are
bifarious, ovate, concave, and closely imbricate; the apex bifid,
the segments in the lower ones being acute, gradually becoming
more obtuse as they approach the involucre, which is