Musci Exoric:.—AHornschuchiant. 
GRIMMIA ATRATA, 
Grimmia caule brevi subramoso, foliis erecto-patentibus 
lanceolato-subulatis, apicibus obtusiusculis concolori- 
bus, nervo crasso, seta exserta, capsula oblongo-ovata, 
operculo conico. (Tas. C.) 
Grimmia atrata. Hoppe et Hornsch. MSS. 
Has. Ad rupes in valle Grosarl in alpibus Salisburgensibus legit 
D. Hornschuch. 
Caules dense pulvinati, vix duas lineas longi, simplices vel hie 
illic ramosi. Folia undique imbricata, erecto-patentia, sicci- 
tate etiam stricta, lanceolato-subulata, canaliculata, apice ob- 
tusa concolora, margine omnino integerrima; inferiora intense 
nigro-fusea, superiora atro-viridia, omnia nervo crasso colore 
intensiore ad apicem percurrente predita. Seta bi-tri-linearis, 
erecta, stricta, Capsula oblongo-ovata, viridi-fusca, demum 
nigra. Operculum conico-obtusum. Calyptra deest. Peri- 
stomium e dentibus constans 16, latiusculis, acutis, transversim 
striatis, flavicantibus, integerrimis, sed hic illic prope apicem 
linea media longitudinali, 
The calyptra of this minute plant 1 have not myself seen. Its 
discoverers have placed it among the Grimmie, where it may be 
placed near Gr. ovaia, from which it is easily distinguished by its 
lesser size, very dark colour, the obtuse and colourless points to 
the leaves, with their thickened nerve and the narrow capsules, 
which become black when the plant is past maturity. Indeed the 
whole plant has a remarkably lurid aspect, and grows in dense 
tufts, which are peculiarly even on their surface. 
Fig. 1, tuft of plants, nat, size. Fig.2, single plant. Fig. 3 
leaves, Fig, 4, teeth of the peristome,—magn, 
