616 Proceedings of the Royal Irish Academy. 



calyptra setulose, forming dense patches closely pressed to the 

 surface, of a pale green colour. On the trunks of trees, Fam- 

 ham demesne, Ballyhaise woods, Killakeen, Slieve Glah, 



Metzgeria furcata, var. /3 fruticulosa, Dicks, Lindberg. Monogr. 

 Metzgeria = Jungermania fruticulosa, Eng. Bot., vol. 35, tab. 

 2514. J. furcata, var. /3 ceruginosa, Hook., Brit. Jung., intextu 

 ad tab. 55 et 56. 



Growing on the bark of trees in compact, crisped tufts, not un- 

 like some of the larger algaB ; fronds dilated near the apex, 

 sharply forked, with the margins shallow and closely recurved, 

 giving the ramuli the appearance of being reduced to the nerve. 

 The colour is a striking verdigris green or blue-green, especially 

 brilliant near the apex of the frond, which is erect or ascend- 

 ing, bearing copious gemmae at the apex. Farnham demesne, 

 plentiful ; oak wood, at Ballyhaise. 



36. Metzgeria conjugata, Dill. (PI. XXII.) ; Lindberg's Monogr. 



Metzgeria. 

 Autoecious ; fi-onds robust, not much elongated, more or less dichb- 

 tomous, irregularly pinnated or decomposite, linear, narrower 

 in some parts than in others, in tranverse section semilunar, 

 hairs longish, singly, often in pairs, on margin and divergent. 

 The paucity of hairs and more homy substance of the fronds 

 with copious innovations, and the autoecious or monoecious in- 

 florescence abundantly distinguish this species from M. furcata, 

 which is dioecious, and all other known species of this singular 

 genus. On the trunks of trees, Farnham demesne, Ballyhaise 

 woods, shores of Lough Cultra on Frullania. 



37. Riccardia multifida, Dill. (Linn.), Eng. Bot., t. 186 ; Hook. Brit. 



Jung., t. 45. On damp ground, Killakeen. 



38. Riccardia sinuata, J)\(ik?, = Jung . pinnatifida, Nees in Mart. Fl. 



Brus., p. 327. Aneura pinnatifida, Dumort. In moist shady 

 places, Killakeen (sparingly). 



39. Riccardia palmata, Hedwig (Lindberg) ; Jungermania palmata, 



Hedwig, Theor. Gen., ed. i., p. 87, tab. 18, figs. 93-95, et tab. 

 19, figs. 96-98 ; Cook, Handbook Brit. Hepat., pi. 7, fig. 91 ; 

 Carrington & Pearson's Exsicc, ISTo. 204. 

 Dioecious ; fronds short, rather crowded, free at the apex, palmately 

 cut, segments linear, and frequently tapering to a point or 

 slightly emarginate ; involucral bracts small ; calyptra small and 

 densely verrucose. On decayed wood, shores of Lough Cultra. 

 This is the only northern station for the plant known to me. 



