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722 353. Polytrichum. 14, MUSCI. Pl.ceU.fol.
jB. Dicksojii. Pedicells very short; siems branched.
Polytrichum Dicksoni, Turner M. Heb. 90; Engl. Bot. 1605.
y nanum. Stem short ; capsules nearly upright, almost
globular.
Polytrichum cajisulis subrotundis, calyptra quasi lacera coionatis, R(tii
Syn. 91,3.
Polytrichum nanum, Hedw. Crypt. 1, 13; Engl. Bot. 1625.
Polytrichum subrotuiidum, Menzies in T. L. S. 4, 69 ; Engl. Bot. 1624.
Polytrichum pumilum, Sioartz M. Suec. 9, 19.
XII. 354. CINCLIDOTUS. Pal. de Beauvois. Net-tooth.
Capsule valveless, pedicelled ; pedicells terminal ; peristome
single, toothed; teeth 32, threadlike, twisted, anastomosing
at the bottom ; calyptra mitreshape. Fruit on
such short branches as scarcely to leave room for more
than the perichetial leaves.
Cindidotusfontinaloides. Fontinalislike net-tooth.
Fontinalis minor, foliis triangularibus minus coinplicatis, capitulis in
snmmis ramulis sessilis, Dillen.in Rail Syn. 79,2.
Fontinalis minor, Lin. S. P. 157 I ; Engl. Bot. 557.
Trichostomura fontinalcides, Hedw. Crypt, 3,36.
Cinclidotus fontinaloides, i?ea«y. Prod. jEth. 28.
On stones and wood in rivers ; perennial ; May to Aug.
XIII. 355. TORTULA. Hedwig. / ^-4 ^ Screw-moss.
Capsule valveless, pedicelled ; pedicell terminal ; peristome
single, toothed; teeth 32, threadlike, twisted, united at
bottom by a tubelike membrane; calyptra halved.
1. Tortula rigida. Stiff screw-moss.
Stem scarcely any; leaves spread open, oblong, stiff;
edge much turned in, main rib broad; capsule oblong;
lid conical, pointed.
Bryum acaulon, ericae tenuifolia? Gerardi folio, Dillen Muse. 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,' IVall screw-moss.
Stem short; leaves spread open, linear, oblong; edge
turned over; main rib produced beyond the leaf into a
white hairlike point; cop «//e oblong ; lid conical, pointed.