Moore — On Irish Hepaticce. 605 



Family 2. TAKGioNiEiE, Dumort. 



Involucre bivalved, sessile near the apex of the frond, monocarpous. 

 Male receptacle in a terminal bivalved loculus. 



Takgionia, Micheli. 



Dioecious. Involucre on the under side of the frond, sessile near the 

 apex. Capsule shortly pedicellate, opening vertically by two mar- 

 ginate valves. Male receptacle on narrow short fronds, near their 

 extremities, similar to the female capsules, but smaller, in which 

 the antheridia are imbedded in a carnose disk. 

 Targionia hypophjUa, Linn. Fronds closely packed together, some- 

 what imbricated, 1 to 2 inches long, narrow, almost linear 

 throughout, obovate at apex, concave, margins purplish black, 

 nearly entire, of a dull green colour, the cuticle rough with 

 raised pores, purplish lunulate scales occur on each side of the 

 midrib as in the other Marchantiese. Fertile involucre large, 

 compared with the size of the whole plant, and conspicuous at the 

 apex of the fronds. 

 Targionia hypophylla, Linn. Sp. PI. 1604 ; "Web. et Mohr, Jr. Germ, 

 p. 391, t. 12 ; Engl. Bot. t. 287 ; Linclenb. Synop. Hep. p. 110 ; 

 Hook. Brit. Fl. ir. p. 55 ; Raddi, in Opusc. Scient. di Bologna, ii. 

 359 ; Taylor, Fl. Hib. pt. 2, p. 55. Targionia Michelii, Corda, in 

 Opiz, ISTatur. in Sturm, Deuts. Crypt, fasc. 22, p. 73, t. 20; Nees, 

 Europ. Leberm., 4, p. 299 ; Gr. L. et JST. Synop. Hep. p. 574 ; 

 Babenh. Hep. Eur. exsic, n. 376, 546. 

 Hab. On warm dry rocks. On the cave hill at Belfast, John Temple- 

 ton, Esq. On dry limestone rocks, Carrigaline, near Cork, Isaac 

 Carroll, Esq. On the warm basaltic rocks at Deerpark, Glenarm, 

 Co. Antrim, 1834, D. M. A good specimen from the latter lo- 

 cality is in the Herbarium of the College of Science, Dublin. This 

 plant is of rare occurrence, and very local in Ireland, 



B. Cleistocaepje, Lindberg. 



Family 3. Biccie^, as emended, Lindberg. 



Terrestrial or aquatic plants. Fruit immersed ia the frond. Style pro- 

 truded above the frond. Colesule and Elaters wanting. Spores 

 with pellucid coats. 



BicciA, Micheli. 



Eiccia, Micheli, Nov. PI. Gen. p. 6, tab. 4, fig. 6 (1729); Linn. 

 Sp. PI., 1 ed., 2, p. 1138 (1753). Riccardia, B. Gray, in Gray's 

 Nat. Arr. Brit. PI. 1, p. 684 (1821). Targionia, Braun, in Flora, 4, 

 p. 2, p. 756 (1821). Biceiella, Braun, in Flora, 4, p. 2, p. 756 

 (1821). Bicciocarpus, Corda, in Opiz, Beitr. i. p. 651, n. 21 



