114 Proceedings of the 'Royal Irhh Academy. 



Eoyal Dublin Society in 1880,^ -svliere I first published the 

 species as Irish. The principal merit of the dra^ving is, that 

 it shows the flagellse, one of the characters by which the 

 plant is so readily distinguished from Jimgermania inflata. 

 The characters of both plants are ably contrasted by Dr. Eichard 

 Spruce : — " Which are for C. fluitans, the stem-rooting by 

 numerous stout ilagellee ; the branches whether foliiferous or 

 floriferous, all postical ; the longer, narrower, and more laxly- 

 reticulate leaves ; the constant presence of folioles ; the 

 cladocarpous inflorescence, the tiistichous female bracts, toothed 

 at the base, the innermost embracing the perianth ; finally 

 by the lineari-fusciform, trigonous, thin perianth. But in 

 Jimgermania inflata there are no flagellse ; the branches arise 

 variously from the mid-axil of a leaf, or from its posticle 

 angle, and the female flowers are borne on the apex of the 

 stem or of long leafy branches ; there are no folioles at all, 

 except rarely a small sub-floral one ; the bracts are distichous 

 conformable to the leaves, and usually remote from the perianth 

 which is pyriform, inflated, and obscurely 4-5 plicate only 

 at the very apex ; it is besides composed of two strata of cells 

 to i of its height." 2 



9. ^CepTialozia ditaricata, Smith, Eng. Bot. t. 719. Spruce in Trans. 



Bot. Soc. Edin., 3, p. 207. In damp shady places on the 

 ground, and on the larger Hepaticse sparingly. 



10. ^ CepTialozia elachista, Jack., in Gottsche et Eabenhor. Hepat. 



Europ. exsicc. Xo. 574, with excellent figure and full descrip- 

 tion by Dr. Gottsche. Monoecious, stems very small and 

 somewhat rigid ; leaves variable, inclined to quadrate, deeply 

 bifid, but sometimes entire segments nearly linear, bearing 

 occasionally a well developed tooth or two, but more frequently 

 without teeth. Eoliole generally present, especially among the 

 perichaetial leaves. Involucral bracts much larger than the 

 cauline leaves, irregularly lobed, lacerated at the margin, and 

 imbricated on every side. Perigonial leaves strongly toothed 

 at their margins, and terminating in longish incurved points. 

 Colesule roundish, or inclined to triangular, but rather vari- 

 able in form, contracted and ciliated at the mouth. Antheridia, 

 with short stalks in the axils of the terminal or cauline 



^ Scientific Proc, E.D.S., vol. iii., 1880. ^ Spnice^on Cephalozia, p. 54. 



