728 
357. Grimmia. 14. MUSCI. 
PI. cell.fol. 
7. Grimmia Donnii. Dorm's grimm. 
Stem short ; leaves lanceolate, awlshape ; points long, 
transparent, hairlike; edge turned in; pedicells long, straight; 
capsule ovate ; teeth of the peristome entire ; licL beaked ; 
leak short. 
Grimmia Donniana, Engl. Bot. 1259. 
Grimmia sudetica ? Schwcegr. Suppl. 24. 
On rocks, in alpine regions. 
XVI. 358. PTERIGONIUM. Swartz. Wing-moss . 
Capsule valveless, pedicelled ; pedicells from the side of 
the stem; peristome single, toothed; teeth 16, not cut, 
equidistant; calyptra halved. 
1. Pterigonium Smithii . Smith's wing-moss. 
Stem much branched; branches pinnate; leaves tongue- 
shape, blunt, not cut, crisp when dry ; edge turned over, 
main rib reaching more than half w r ay up ; pedicells very 
short; lid beaked. 
Pterogonium Smithii, Swartz in Schrad. Jour. 2, 173; Engl. Bot. 1326. 
Hypnum Smithii, Dickson Crypt. 2, 10. 
Poly trichum Smithii, Hull. Engl. Fl. 249. 
On the trunks of trees ; perennial ; spring. 
2. Pterogonium gracile. Slender wing-moss. 
Branches in bundles, bent ; leaves broad, ovate, pointed, 
concave; edge flat; tip serrated; base slightly 2-ribbed ; 
lid conical. 
Hypnum gracile ornithopodioides, Dillen. Muse. 320. 
Hypnum gracile, Lin. M ant. 310. 
Hypnum ornithopodioides, Huds.Angl. 508. 
Pterogonium gracile, Swartz M. Suec. 26 ; Engl. Bot. 1085. 
Pterigynandrum gracile, Hedw. Sp. Muse. 80. 
Encalypta gracilis, Roth Germ. 3, 154. 
Grimmia ornithopodioides, Mohr. 
On subalpine rocks. 
3. Pterogonium filiforme. Threadlike wing-moss. 
Stem irregularly branched, bent; leaves ovate, rather 
pointed, concave ; edges turned over, serrate ; main rib 
single or forked, short, faintly marked; lid conical. 
Hypnum cylindricum, Dickson Crypt. 2, 12. 
Pterogynandrum filiforme, Hedw. Crypt . 4,7. 
Pterogonium filiforme, Engl. Bot. 2297. 
Pterogonium coespitosum, Engl. Bot. 2526 
Grimmia filiformis, Mohr . 
On mountains. 
