66 THE MICROSCOPICAL NEWS. 
is the genus Grimmia, and although one or two species are some- 
times found on walls and trees, it may be said to be peculiar to 
mountainous rocks. 
The species G. apocarpum and G. Doniana, as wellas G. ovata, 
fruit both in the spring and autumn. 
Those of the more common species exhibit well marked dif- 
ferences. Schistidium apocarpum, the sessile-fruited Grimmia, has 
the capsules immersed and almost sessile at the apex of the stem; 
the leaves being lanceolate-acuminate from an ovate base, and 
the nerve ceasing below apex. G. pulvinata, the grey-cushioned 
Grimmia, has capsules drooping, ovoid, eight-furrowed, and much 
exserted ; leaves elliptic lanceolate, terminated by the nerve ex- 
current with a long hair point; while in G. Donzana the capsule 
is quite smooth and slightly exserted, the erecto-patent leaves 
being lanceolate-elongate and tapering into a roughened hair point. 
Also with a rough hair point to the leaf, and the capsule more 
exserted than the last is G. ovata, the oval-fruited Grimmia. G. 
confertum, the close-tufted Grimmia, has almost sessile and smooth 
capsules, similarto G.apocarpum, the strongly-nerved ovate-lanceolate 
leaves having thickened margins ; they are an intense green above 
while blackish below. 
The following are not mentioned as found fruiting in Britain :— 
G. anodon, G. crinita, G. subsquarrosa, G. robusta, G. contorta, 
G. elatior, G. Hartmanni, G. Ungeri, G. montana, and G. elongata. 
Many of these are very rare. G-. orbicudaris is found fruiting in 
February on limestone rocks, and in the spring G. commutata on 
dry quartzose rocks at Clova in Scotland. 
Allied to Grimmia, but consisting of taller and handsomer Mosses 
are the Fringe Mosses. hacomitrium. R. fasciculare, the green 
mountain Fringe Moss, grows on rocks in loose irregular patches 
of a light green colour, and has crowded leaves, lanceolate, from. 
a broad base, with margins recurved, areolz long, narrow, sinuous ; 
capsule elliptical, with a long, subulate lid ; calyptra very papillose. 
R. heterostichum, the bristly mountain Fringe Moss, grows in 
round hoary patches: its crowded lanceolate leaves taper into a 
long silvery denticulate point ; capsule sub-cylindrical, mouth very 
small ; calyptra papillose at apex only. 
R. languinosum, the woolly Fringe Moss, grows in extensive 
hoary patches, especially at a considerable elevation, with slender 
fragile stems, often a foot long; leaves lanceolate, spreading, 
tapering into an elegant toothed diaphanous point ; capsules small, 
ovoid on a short roughish seta, owing to the irregular growth of 
innovations, the fruit usually appears to be lateral. 
The teeth of the peristome and the lid are both nearly as long 
as the capsule; calyptra papillose at apex. &. canescens, the 
hoary Fringe Moss, is found on sandy heaths and stony places in 
