Moore — On the Mosses of Ireland. 
373 
Diagnosis of Species, 
A. Inflorescence dioicous. 
Capsule exannulate, erect ; leaves adpressed 
at base, oblong, mucronulate, . . 1 . T. flavovirpjn-s. 
Capsule annulate, ovate ; leaves, withthemar- 
gins of upper half incurved, cucuUate, 
at apex mucronate, . . . . 2. S. ceispum. 
Capsule annulate; leaves mucronate, not 
cucuUate at apex, . . . . 3. T. mutabile. 
B. Inflorescence monoicous. 
Leaves softish, lanceolate, rather obtuse ; 
nerve disappearing near the apex, . 4. T. tophaceum. 
1. T. flavovirens (Bruch.) in Miill. Muse. Sardin. Bryol. Europ., voL 
II. Monogr., p. 6, tab. 172. Mitten in Seemann's Journal of 
Botany," vol. vi., 1868, p. 97, tab. 77, f. 1. Briol. ItaL, p. 
502. 
Hab. Sand hills at Portmarnock and between Malahide and Portrane 
in great abundance, but always barren. It also grows on banks 
facing the sea at Howth ; Arklow, Wicklow. 
2. T. crispulum (Bruch et Schimp.). Bryol. Europ., vol. ii. Monogr., 
p. 7, tab. 173. Bryol. Brit., p. Ill, tab.4l, Briol. Ital., p. 503. 
Eabenhor., Bryothec. Europ., No. 532. Didymodon crispulus, 
Tayl. in El. Hib., p. 18. 
Hab. Eocks and banks on limestone formations chiefly, but also 
on slate, basalt, &c., in many parts of Ireland. AtMuckross, 
in fruit, June, 1864; Dunkerron, Kerry; Benbulben, Sligo. 
3. T. mutabile (Br. et Schimp.). Bryol. Europ., vol. ii. Monogr., p. 
8, tab. 171. Bryol. Brit., p. 112, tab. 41. Briol. ItaL, p. 304. 
Eabenhor., Bryothec. Europ., JN'o. 559. Didymodon brachy- 
dontius, Tayl. in El. Hib., p. 18. Gymnostomum tortile, 
ibid., p. 10. 
Hab. Eocks and moist banks. Yery frequent in the southern coun- 
ties. It also occurs in considerable abundance on the basaltic 
rocks of Antrim, but generally barren. Eruiting near Kenmare, 
Co. Kerry. 
