638 Proceedings of the Royal Irish Academy. 



2. Scapania subalfina, Dumortier. Var. fS. widulifolia. Steins sub- 



erect, dichotomously branched. Leaves bifarions, semi-amplexi- 

 caul, and slightly decurrent, conduplicately bilobed, lobes nearly 

 equal. 

 Jungermannia snbalpina, ]N^ees, apud Lindenb. Hep. p. 55 ; Ekart, 

 Synop. Jung. p. 27, t. 11, fig. 91. Scapania snbalpina, Gr. L. et 

 N. Synop. Hepat. p. 64, var. p. p. 65 ; Dumort. Eev. Jung, 

 p. 14 •, Hepat. Europ. p. 36. 



Hab. Rivulets "where the water is constantly trickling over. Lugna- 

 quilla Mountain, Co. "Wicklow, 1864; Nephinbeg, Co. Mayo, 

 1862. The Irish specimens, var. /3., have the stems more slender, 

 radiculose underneath. Leaves broader, lobes more spreading. 



3. Scapania nimlrosa, Taylor. Stems ascending or erect, slightly 



branched. Leaves bilobed, imbricate, dentate-ciliate, nearly equal 

 in size, lower lobe oblong-ovate, patent. 

 Scapania nimbrosa, Taylor, in Lehm. Pugill. Plant. 8 (1844), p. 6; 

 Gr. L. et jST. Synop. Hepat. Europ. p. 662 ; Dumort. Hepat. 

 Europ. p. 36 ; Cooke, Brit. Hepat. p. 6, fig. 46. 



Hab. Among the larger mosses, &c. On Brandon Mountain, Co. 

 Kerry, Dr. Taylor. I know nothing of this plant farther than 

 the quotations transcribed testify. 



(h). Leaves broader than long ; loles rounded or Hunt. 



4. Scapania undulata (Linn., Dill.), Dumort. Stems ascending, slightly 



branched. Leaves unequally 2-lobed, entire or denticulate, loose, 

 patent, rounded, trapezoidal, of flaccid texture, Eruit terminal. 

 Colesule oblong-incurved, mouth truncate, nearly entire. 



Jungermannia undulata, Linn. Sp. PI. 1598 ; Hook. Brit. Jung. tab. 

 22; Sm. Engl. Bot. t. 2251 ; JN'ees, Europ. Leber. 1, p. 184; 

 Ekart, Syn. Jung. p. 26, t. 2, fig. 14. Eadula undulata, 

 Dumort. Comm. Bot. p. 112. Scapania undulata, Dumort. 

 Jung. p. 14 (1835) ; Hepat. Europ. p. 37 (1874); G. L. et K 

 Synop. Hepat. p. 65 (1844) ; Gottsche et Rabenhor. Hep. 

 Eur. exsic. n. 194, 34, 90, 260, 291 ; Cogn. Hepat. Belg. p. 20. 



Hab. Streamlets among the hills. This, one of our largest and finest 

 British species, is of frequent occurrence in Ireland. The stems 

 sometimes attain to the length of 3-4 inches, and are generally 

 of a purplish colour, or of a bright shining green. 



Var. p. purpurascens, Hiiben. Germ. Hepat., is common in Co. Kerry. 



Var. e. speciosa, Rabenhor. Hep. Eur. exsic. n. 442, was collected 

 near Lugnaquilla, Co. Wicklow. A very large and unusual 

 form occurs in the deep lake at the top of the glen leading to 

 Brandon Mountain from the Clogreen side. There the plant 

 floats in deep water, and has black wiry stems six inches or more 

 in length, with intensely green leaves, much cut and lacerated by- 

 aquatic insects. 



