390 Proceedings of the Royal Irish Academy. 
Hab. On rocks in snbalpine districts. On basaltic rocks near the 
Giants' Causeway, 1837 ; Pairhead, Antrim. Eocks at Croma- 
gioun, Kerry, Dr. Carrington. Bare in Ireland. 
13. 0. Lyellii (Hook, et Tayl.). Muscol. Brit., p. 129, tab. 22.- 
Bryol. Europ.,_ vol. ni. Monogr., p. 27, tab. 221. Bryol. 
Brit., p. 183, "tab. 22. Babenhor., Bryothec. Europ., No. 
1006. 
Hab. On trunks of trees, &c. In fruit at "Westaston, "Wicklow ; 
also near Boundwood. In many parts of Ireland, but rarely 
found in fruit. 
14. 0. diaphanum (Schrad.). Spicil. El. Germ., p. 69. Bryol. 
Europ., vol. m. Monogr., p. 25, tab. 219. Bryol. Brit., p. 
185, tab. 21. Muscol. Brit., p. 128. 
Hab. On trees. This small species grows everywhere through Ire- 
land, and is easily recognised by the white diaphanous points 
of its leaves. 
15. 0. leiocarpum (Br. et Sch.). Bryol. Europ., vol. ni. Monogr., 
p. 28, tab. 220. Bryol. Brit, p. 186, tab. 21. Babenhor., 
Bryothec. Europ., 516. 0. striatum Hedw. Turner, Muse. 
Hib., p. 95. Muscol. Brit., p. 128. 
Hab. On trees. In most parts of Ireland. It is easily recognised, 
by its large, coarse tufts of stems, and by the smooth, whitish, 
round capsules, when growing among other Orthotrichi. 
16. 0. pulchellmi (Smith). Engl. Bot., tab. 1787. Muscol. Brit., 
p. 134, tab. 21. Bryol. Europ., vol. nr. Monogr., p. 30, tab. 
223. Bryol. Brit., p. 186, tab. 21. 
Hab. On trunks of trees. In Antrim and Berry ; Ballinascorney 
Glen, Dublin ; Carton Demesne, Maynooth. Bockingham, near 
Boyle, Boscommon ; Bonayne's Court, and in a grove at Blar- 
ney, Murray in EL, Cork. Not very common in Ireland. 
17. 0. Ludwigii (Schwaegr.). Suppl. 1, 2, 24, tab. 15. Bryol. 
Europ., vol. III. Monogr., p. 12, tab. 225. Bryol. Brit., p. 
187, tab. 34. Ulota Ludwigii, De Notr., Briol. Ital., p. 291. 
Babenhor. Bryothec. Europ., No. 519. 
Hab. On trees, principally young oaks in snbalpine glens. Ireland 
rare, Wils., Bryol. Brit., p. 187. Oaks at Tore wood and Glena 
wood, Killarney, Dr. Carrington. 
18. 0. Drummondii (Hook, et Grev.), in " Edin. Journ. of Science," 
vol. I., p. 120. Muscol. Brit., Ed. 2, p. 126. Bryol. Europ., 
vol. III. Monogr., p. 12, tab. 210. Bryol. Brit., p. 189, tab. 
34. Ulota Drummondii, Bridel , Bryol. IJniv. 1, p. 299. Ba- 
benhor., Bryothec. Europ., No. 881. 
