728 357. Grimmia. 14. MUSCI. Pl. cell, fol. 
7. Grimmia Donnit. Donn’s grimm. 
Stem short; leaves lanceolate, awlshape; points long, 
transparent, hairlike; edge turned in; pedicells long, straight; 
capsule ovate; teeth of the peristome entire; /id beaked; 
beak short. 
Grimmia Donniana, Engl. Bot. 1259. 
Grimmia sudetica? Schwegr. 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 Smithi. Smith’s wing-moss. 
Stem much branched; branches pinnate; /eaves tongue- 
shape, blunt, not cut, crisp when dry; edge turned over, 
main rib reaching more than half way up; pedicells very 
short; lid beaked. eer! 
Pterogonium Smithii, Swartz in Schrad. Jour, 2,173; Engl. Bot. 1326. 
Hypnum Smithii, Dickson Crypt. 2, 10. 
Polytrichum Smithii, Hull. Engl. Fl, 249. 
On the trunks of trees; perennial; spring. 
2. Pterogonium gracile. Slender wing-moss, 
Branches in bundles, bent; /eaves broad, ovate, pointed, 
concave; edge flat; tip serrated; base slightly 2-ribbed ; 
lid conical. 
Hypnum gracile ornithopodioides, Dillen. Musc. 320. 
Hypanum gracile, Lin. Mant. 310. 
Hypnum ornithopodioides, Huds. Angl. 508. 
Pterogonium gracile, Swartz M. Suec. 26; Engl. Bot. 1085. 
Pterigynandrum gracile, Hedw. Sp. Musc. 80. 
Encalypta gracilis, Roth Germ. 3, 154. 
Grimmia ornithopodioides, Mohr. 
On subalpine rocks. 
3. Plerogonium filiforme. Threadlike wing-moss. 
Stem irregularly branched, bent; leaves ovate, rather’ 
pointed, concave ; edges turned over, serrate; main rik 
single or forked, short, faintly marked; lid conical. 
Hypnum cylindricum, Dickson Crypt. 2, 12. 
Pterogynandrum filiforme, Hedw. Crypt. 4,7. 
Pteregonium filiforme, Engl. Bot. 2297. 
Pterogonium cespitosum, Engl. Bot, 2526. 
Grimmia filiformis, Mohr. 
On mountains. 
