416 Proceedings of the Royal Irish Academy. 
54. HooKEEiA. Smith. 
Calyptra large, mitriform, conoidly- attenuated, constricted at first at 
the base, afterwards lobed. Capsule on a long, thickish pedicel 
ovate, symmetrical, nutant or horizontal ; lid conic-rostrate. 
Peristome double, the exterior of 1 6 linear-lanceolate teeth, closely 
articulated ; inner a membrane cut into 1 6 cilia, without internal 
ciliolae. Leaves complanate, spreading laterally, ovate or ovate- 
lanceolate; areolation large, loose, formed of hyaline, ovate, 
hexagonal, cellules. Inflorescence usually monoicous. 
Diag7iosis of Species. 
Stem procumbent, compressed; leaves bi- 
farious, obovate, obtuse, entire, nerve- 
less, 1. II. LUCENS. 
Stems procumbent subpinnate; leaves bi- 
farious, acuminulate, marginate, doubly 
nerved half way, serrulate at apex, . 2. H. l^^tevieens. 
1. H. lucens (Idill.). Dill., Muse, tab. 34, f. 10. Engl. Bot., 
tab. 1902. Bryol. Brit, p. 416, tab. 27. Pterygophyllum 
lucens, Bridel, Bryol. IJniv. 2, p. 343. De Notr., Briol. ItaL, 
p. 62. Kabenhor., Bryothec. Europ., IS'o. 2. 
Hab. Damp shady banks, and by the sides of rivulets. Frequent 
and generally distributed through Ireland, particularly in the 
more hilly parts of the country. 
2. H. l(Etevirens (Hook, et Taylor). Muscol. Brit., p. 149. BryoL 
Brit., p. 417, tab. 27. Hookeria albicans, Tayl. in El. Hib., 
p. 36. Eabenhor., Bryothec. Europ., ]^o. 586. Pterygophyl- 
lum Isetevirens, Bridel, Bryol. Fniv. 2, p. 350. 
Hab. Shady wet rocks, and sides of streams. Eirst found by 
Mr. James Drummond, at Dunscombe's Wood, near Cork; 
at O'SuUivan's Cascade, and Tore Waterfall, Killarney, W. H. 
Harvey, where I have since collected it, in company with Dr. 
Schimper and Mr, Wilson, in June, 1866. Glendine Wood, 
Waterford, Thomas Wright, /rt'^? Isaac Carroll, 
