97 
NEW OR RARE BRITISH MOSSES. 
By Wiii1am Mirren, Ese., A.L.S. 
(Prate LXXVIIL.) 
Trichostomum flavo-virens, Bruch and Miller in (Regensb.) Bot. Zeit. 
1829, p. 304. t. 7. Stems short, simple or dichotomous. Leaves 
patent from a more erect base, the lower ones smaller, shorter, and 
more erect, the upper longer, more spreading, and forming a rosette or 
coma, from which the stems are continued by innovations, in which 
the same arrangement of the leaves is reproduced, and the foliage is 
thus repeatedly interrupted; all the leaves are oblong-ligulate, obtuse, 
acute or mucronate, the apex flat or sometimes a little hooded, the 
margins entire and mostly incurved, so that the leaf is channelled; the 
nerve prominent on the bark is nearly of the same colour as the leaf, 
and is usually excurrent into a very short mucro ; the cells of the upper 
portion of the leaf are rounded or subquadrate, all obscure, green or 
yellowish-green, when revived after long desiccation they are greyish or 
glaucous-green ; at the base of the leaf the obscure cells are suddenly 
changed into elongate rectangulate white pellucid cells, which are con- 
tinued nearly as far again up the margins of the leaf as they are in its 
middle, where they occupy a space in length about equal to the width 
of the leaf at that part. The pericheetial leaves, except in being a little 
narrower, scarcely differ from those of the coma. ‘The seta is red, a little 
flexuose. The capsule is oblong-cylindrie or ovate-oblong, pale yel- 
lowish-brown, its mouth red. The operculum is acuminate, and about 
half as long as the capsule. The peristome, which is as long as the 
operculum, is composed of thirty-two erect, filiform, minutely dotted 
red teeth united at the base in pairs, and arising from a very short 
membrane. The calyptra is pale and glossy.—The male plant is 
more slender, with the antheridia enclosed by many small leaves into 
a terminal bud.—Has. Shoreham Beach, Sussex, always sterile. 
Originally gathered in Sardinia by Müller, it is now known to grow 
along the northern and southern coasts of the Mediterranean, and 
fertile specimens were gathered on the coast of Portugal by Dr. 
Welwitsch. 
In habit and size this species agrees nearly with 7. brachydontium, 
Bruch and Müller (Regensb.), Bot. Zeit. 1829, p. 393. t. 3 (Didy- 
VOL. vi. [APRIL 1, 1808.] H 
