Moore — On Irish Sepaticce. 601 



Marchantia polymorplia, Linn. Sp. PL 1603. Marchant fil in Acta 

 GaL 1713; Mieheli, Nov. PL Gen. t. 1, figs. 1, 2, 5; Dill. Muse, 

 t. 76 ; and t. 77, fig. 7 ; Engi. Pot. t. 100 ; Muse. Prit. ecL 2, 

 p. 2, p. 219 ; Lindenberg, Synop. Hep. Europ. p. 100 ; Taylor, in 

 EL Hib. p. 49 ; Dumortier, Hepaticse Europse, p. 150. 



Hab. In moist situations generally, sometimes in dry places. Espe- 

 cially abundant on the surface mould of pots in the Potanic 

 Gardens, where it is frequently subjected to high temperatures, 

 under which treatment both male and female receptacles are 

 abundantly produced. 



CoxocEPHALTJS, I^eck. Dmrt. 



MarchantisB sp. Linn. Sp. PL (1753). Conocephalus, J^eck. Elem. Pot. 

 m., p. 344 (1790). Dmrt. Comm. p. 115 (1822). Pegatella, 

 Eaddi, in Op. Scient. di Eologna, ii. 356 (1818). IS'ees, Europ. 

 Leberm., 4, p. 170. 



Dioecious. Fertile receptacle conical or mitriform, covering the loculi, 

 which are from 4-5, and monocarpous, opening with a vertical 

 fissure. Colesule wanting. Calyptra bell-shaped, persistent in the 

 loculus. Antheridia immersed in sessile oval disks, near the apex 

 of the frond. 



Conocephalus conicus, Neck. Dumort. Eronds large, varying much 

 in width, crenate, undulate at the margins. " Puds appear in 

 winter between the terminating lobes, their margins involute, the 

 entire ascending, recurved, at length opening into light, shining, 

 green fronds. The scales beneath are subrotund, oblique, slightly 

 emarginate. The male receptacle is hemispherical and smooth 

 below, nearly flat above, immersed in a cavity of the frond, but 

 not adhering to it except by a central point at the bottom ; the 

 upper surface is rough, with conical elevations, the tops of whitish 

 antheriferous vesicles ; the anthers are linear, oblong, coming to 

 maturity the summer previous to the ripening of the seeds ; female 

 receptacles fully formed in October remain sessile on the fronds 

 until the following Eebruary, when at length the peduncles 

 arise." — Taylor, in Flora Hibernica. 



Marchantia conica, Engl. Pot. t. 504, Muse. Prit. cd. 2, p. 221. 

 Conocephalus conicus, Dumort. Hepat. Europ. p. 155. Cono- 

 cephalus vulgaris, Pisch. in Nov. Act. Nat. Curios. 17, p. 979. 

 Eegatella eonica, G. L. et N. Synop. Hepat. 546 ; Eabenhor. 

 Hep. Europ. exsic. &c., 299-329. 



Hab. Damp shady places, where the mass of fronds sometimes spread 

 over several feet in diameter continuously. If taken in and put 

 in a pot or box, covering the surface with a pane of glass, the 

 latter will after a few days become more or less covered with the 

 antheridia, which are jerked out of their receptacles with such 

 force as to make them adhere to the covering glass. 



