722 353. Polytrichum. 14. MUSCI. _—P. cell.. fol. 
'B. Dicksoni. Pedicells very short; stems branched. 
Polytrichum Dicksoni, Zurner M. Heb. 90; Engl. Bot. 1605. 
-y nanum. Stem short; capsules nearly upright, almost 
globular. 
Polytrichum capsulis subrotundis, calyptra quasi lacerd coronatis, Rati 
Syn. 91, 3. 
Polytrichum nanum, Hedw. Crypt. 1,13; sae Bot. 1625. 
Polytrichum subrotundum, Menzies in 7. L. S. 4, 695 Fchi Bot. 1624. 
Polytrichum pumilum, Swartz M. Suec. 9, 19, 
XII. 354. CINCLIDOTUS. Pal. de Beauvois. Net-tooth. 
Capsule valveless, pedicelled ; pedicells terminal; per?- 
stome single, toothed; teeth 32, threadlike, twisted, anas- 
tomosing at the bottom ; calyptra mitreshape.— Fruit on 
such short branches as "scarcely to leave room for more 
than the perichetial leaves. 
Cinclidotus fontinaloides. ; Fontinalislike net-tooth. 
Fontinalis minor, foliis triangularibus minus So DISET capitulis in 
summis ramulis sessilis, Dillen. in Raii Syn. 19, 2. 
Fontinalis minor, Lin. S. P. 15713; Engl. Bot. 557. 
Trichostomum fontinalcides, Hedw. Crypt. 3, 36. 
Cinclidotus fontinaloides, Beauv. Prod. Ath. 28. 
On stones and wood in rivers; perennial; May to Aug. 
XIII. 355. TORTULA. Hedwig. /*%? —Screw-moss. 
Capsule valveless, pedicelled ; pedicell terminal ; peristome 
single, toothed; teeth 32, threadlike, twisted, nite at . 
bottom by a tubelike membr ane; calyptra halved. 
1. Tortula rigida. Stiff screw-moss. 
Stem scarcely any 5 leaves spread open, oblong, Stith; 
edge much turned in, main rib broad; capsule oblong 
lid conical, pointed. 
Bryum acaulon, erice tenuifolia Gerardi folio, Dilien Musc. 388. 
Tortula rigida, ‘Swartz M. Suec, 40. 
Barbula rigida, Hedw. Crypt. 1, 65. 
Bryum rigidum, Huds. Angl. 477; Engl. Bot. 180. 
On rocks, clay-banks, and chalk-cliffs. 
2. Tortula muralis.~ Wall screw-moss. 
Stem short; leaves spread open, linear, oblong ; edge 
turned over; main rib produced beyond the leaf into a 
white hairlike point; capsuée oblong ; lid. conical, pointed. 
