630 Proceedings of the Royal Irish Academy. 



Perigonial bracts smaller, imbricated, bilobed. Antheridia 

 usually solitary, in the saccate axils of the perigonial bracts. 



Plagiochila pyrenaica, Spruce, Hepat. Pyren. n. 9. (1847), and in 

 Trans. Bot. See. Edinb. m., p. 200(1849); Lindb. Manipulus 

 Muscorum secundums in Faun, et Flor. Penn., 13, p. 366 (1874). 

 Plaoiochila interrupta, var. ^8. pyrenaica, Carring. Brit. Hepat. pi. 

 3, figs. 2-9 (1874). 



Hab. Shady rocks and banks, mostly in limestone districts. On 

 rather dry banks through the Benbulben range, Co. Sligo, where 

 I collected it for the first time it was found in Ireland (1871) ; 

 again at Gleniff, in same district (1875). This plant may be 

 quoted as an instance of the difficulty which the Hepaticse present 

 to the systematist, in not affording good generic characters, that 

 can be stated in words which will enable the student to distin- 

 guish them clearly one from the other. As Dr. Lindberg well 

 observes in his description of this plant in his Irish Hepaticae, 

 it possesses nothing in common with Plagiochila, except the com- 

 pressed colesule. The affinities are altogether with the Chilo- 

 scyphiae. In general appearance it resembles C. polyanthos ; yet 

 it approaches even more both in habit and aspect Saccogyna viti- 

 culosa, 



Chilosctphtjs, Corda. 



Jungermannia, Mich. Nov. PI. Gen. p. 8, tab. 5, fig. T) (1729); 

 Linn. Sp. PI. 1 ed., 2, p. 1131 (1753); Hook. Brit. Jung. (1816). 

 Mylia, B. Gray, in Gray's I^at. Arr. Brit. PI. 1, p. 693 (1821). 

 Marsupella, Dumort. Comm. Bot., p. 114 (1823). Chiloscyphus, 

 Corda, in Opiz, Beitr. 1, p, 651 (1829); Dumort. Syll. Jung. 

 Europ., p. 67 (1831). 



Involucral bracts imbricated on each side and notched at the margin. 

 Colesule rather short and bilabiate, the lips irregularly notched, 

 fruit stalks long, pedicels inarticulate, rising from the under part 

 of the stem. 



Chiloscyphus polyanthos, Corda. Stems prostrate, growing in patches. 

 Leaves in two rows, overlapping, inclining to quadrate, entire 

 or slightly emarginate. Amphigastria bifid, toothed or variously 

 cut. Colesule short, cleft into two lips, which are laciniated. 



Jungermannia polyanthos, Linn. Sp. PI. 1597; Hook. Brit. Jung. 

 t. 62 ; Lindenb. Synop. Hepat., p. 30. Marsupella polyanthos, 

 Dumort. Comm. Bot., p. 114. Chiloscyphus polyanthos, Corda, in 

 Sturm, Deutschl. Crypt. 19, p. 33, t. 9; Dumort. Syll. Jung., p. 67, 

 t. 1, f. 9; et Jung. Europ., p. 101; G. L. et N. Synop. Hepat., 

 p. 188. 



Var. ft. rivularis, Nees. Stems dichotomous, succulent. Amphigastria 

 sometimes obsolete. 



