Pil. cell. fol. 14. MUSCI. 363. aiesnieiiaas 743: 
5. Didymodon rigidulm. 1) 1. Stiffish twine tooth. 
. Leaves closely: ‘tiledlike -on “all! ides lanceolate, very 
pointed, keeled; main rib stiff, running) beyond the’ ge 8 
capsules oblong, ovate, uprights. lid beaked? 
Didymodon rigidulum, Hedw. S, Musc. 104. 
: earns rigidulum, Dickson Crypt. 4, 12. oO 
‘Trichostomum rigidulum, Turner M Hib. 34 3; Engh Bots 2178. 
Bryum lineare, Dickson Crypt.:3, 6. mth 4 
Trichostomum lineare, Engl. But. 1598. 
- On rocks and walls; perennial ; “April. 
Very similar to tor tula fallax, gen. 355, spo. 
6. Didymodon trifarium.... .. Three-rowed twin-tooth. 
Leaves rather distant, somewhat three-rowed; lanceolate, 
bluntish, keeled; main rib_ scarcely: reaching’ the tip; cap- 
sude oblong, ovate, upright; lid beaked. 3 
rea trifarium, Swartz M. Suec. 28. 
Cynontodium trifarium, Hedw. S. Muse. 57. 
_ Swartzia trifaria, Hedw. Crypt. 2, 76. 
Bryum trifarium, Dickson Crypt. 3, 8. 
Trichostomum trifarium, Engl. Bots VIO, 
Trichostomum linoides,. Eng vl, Bot. 2295, not of Dickson. : 
On moist banks. 
7. Didymodon Lapllaccum 9 Fairy twin-tooth. 
Stem long; leaves nearly 2-rowed, awlshape, bristlelike ; 
opens upright, ovate, cylindrical ; lid conical. 
Trichostomum capillaceum, Engl. Bot. 1152. 
‘Cynontodium capillaceum, Hedw.'S. Musc. BT 
Swartzia capillacea, Hedw. Crypt. 2,,72.. 
Didymodon capillaceum, Schrad. Gara, 64, 
Bryum capillaceum, Dickson Crypt. 1, 4. 
Bryum zstivum, Hudson Angl. 485. 
On mountain banks. 
‘8. Didymodon heter omallum.-~  Odd=sided twin-tooth. 
Stem rather: short; leaves mostly’ facing one _ pats awl- 
shape; capsule ovate, cylindrical; lid conical.’ 
‘. Grimmia heteromalla, Roth Germ. 3,145; Engl. Bot. 1899. 
Weissia heteromalla, Hedw. S. Musc. 71. 
. Afzelia heteromallay-Ehrh. Crypt. 173. alssortod MOWO es 
Bryum Weissia, Dickson Crypt. 2, 5. 
Didymodon heteromallum, Hedw.S: Mrs: 23. 
On mountains. 
