742 
PL cell.fol. 
363 . Didymodon. 14. MUSCI. 
a. Capsules inclined. 
1. Didymodon purpureum. * Purple twin-tooth. 
Stem scarcely branched ; leaves lanceolate, pointed, 
keeled; edge turned over, not cut; capsule ovate, cylin- 
drical, oblique, with a slight tubercle, furrowed when dry ; 
lid conical. 
Bryum perangustis crebrioribus foliis, capitulis erectis, longiusculis pe- 
diculis e surculis annotinis innascentibus, Dillen in Raii Syn. 99, 41. 
Bryum Celsii, Lin. S. P. 1585; Dickson €rypt. 3, 7. 
Mnium purpureum, Lin. S. P. 1575 ; Wither. Arr. 802. 
Dicranum purpureum, Hedw. S. Muse. 136; Engl. Bot. 2262. 
Dicranum intermedium, Hedw. S. Muse. 138. 
Bryum bipartitum, Dickson Crypt. ; Engl. Bot. 2357. 
Bryum strictum, Dickson Crypt. 4, 13. 
Bryum tenue, Dickson Crypt. 3,8. 
Bryum papillosum, Dickson Crypt. 4, 12. 
Dicranum strictum, Engl. Bot. 2294. 
Dicranum Celsii, Hedw. S. Muse. 149 ; Engl. Bot. 2418. 
Trichostomum papillosum, Engl. Bot. 2533. 
Red shanks. 
On moist banks. 
2. Didymodon inclinaium. Inclined twin-tooth * 
Leaves in two rows, awlshape, sheathing at bottom ; cap- 
sule ovate, inclined ; lid conical. 
Didymodon inclinatum, Swartz M. Suec. 28. 
Bryum inclinatum, Dickson Crypt. 3, 9. 
Swartzia inclinata, Hedw. Crypt. 2,74. 
Cynontodium inclinatum, Hedw. S. Muse. 58. 
Grimmia inclinata, Engl. Bot. 1824. 
On rocky mountains ; perennial ; summer. 
b. Capsules upright . 
3. Didymodon nervosum, Ribbed twin-tooth . 
Leaves reverse-ovate, main rib thickened above; tip 
short ; capsules ovate, upright ; lid beaked ; beak short, 
Grimmia atrovirens, Engl. Bot. 2015. 
On dry banks by the sea. 
Resembles weissia lanceolata, gen. 359, sp. 7. 
4 . Didymodon fleocifolium. Bent-leaf twin-tooth. 
Stem long; leaves oblong, ovate, bent, deeply serrated 
at the tip; capsules upright, cylindrical; lid beaked. 
Bryum Hexifolium, Dickson Crypt. 3, 5. 
'Trichostomum flexifolium, Engl. Bot. 2490. 
On barren banks, or roofs. 
