656 Proceedings of the Royal Irish Academy. 



86-254. Marsupella Punckii, Dumort. Rev. Jung. p. 24, et 

 Hepat. Europ. p. 128. 



Hab. On moist shady banks, and argillaceous rocky places. Black 

 Mountain, near Belfast (1837) ; mountains above Kylemore lake, 

 Co. Galway (1874). 



4. Nardia revoluta (Nees), Lindb. Stem matted, flagilliferous at the 



base, densely tufted. Leaves obovate-elliptic, imbricated, semi-am- 

 plexicaul at the base, reflexed at the margin, acutely emarginate. 

 Sareoscyphus revolutus, I^ees, Leberm. Eur. 2, p. 419; G. L. etiN". 

 Synop. Hep. p. 8. Marsupella revoluta, Dumort. Hepat. Europ. 

 p. 126. Nardia revoluta, Carring. Grevillea, n. 18, p. 88, fig. 

 19-25 (1873) ; Brit. Hepat. p. 22; Lindb. Eevis. Crit. Fl. Dan. 

 p. 113 (1871). 



Hab. On rocks at Luggielaw, "Wicklow, Mr. David Orr (1851). Not 

 found by any other person in Ireland. This rare plant I collected 

 in some quantity on rocks above Jerkin station, on the Dovre- 

 field, Norway, in 1864. 



Section B. Mesophtlla, Dumortier. 



5. Nardia scalaris (Schrader), B. Gr. Dioecious. Stem ascending, 



radiculose. Leaves two-ranked, accumbent, roundish, entire, or 

 rarely subemarginate. Amphigastria broadly subulate. Invo- 

 lucre urceolate. 



Juugermannia scalaris, Schrad. Samml. 2, p. 4 ; Hook. Brit. Jung. t. 

 61 ; Lindenb. Synop. Hepat. p. 28 ; Nees, Europ. Leberm. p. 281. 

 Mesophylla scalaris, Dumort. Comm. Bot. p. 112; Bev. Jung, 

 p. 24. Aliciilaria scalaris, Corda, in Opiz, Natural, p. 653 ; G. 

 L. et N. Synop. Hep. p. 10 ; Gottsche et Eabenhor. Hep. Europ. 

 exsic. n. 69, 70, 232-381 ; Dumort. Hepat. Europ. p. 131 ; Nar- 

 dius scalaris, B. Gr. in Gray's Nat. Arr. Br. PI. 1, p. 694, n. 1 

 (1821); Carrington, Brit. Hepat. p. 23. 



Hab. On moist clay banks, among heath and other herbage. Very 

 abundant throughout Ireland. It varies considerably in form 

 according to the nature of some localities where it grows. A very 

 remarkable form, the var. /3. rivularis, Lindb., grows in very wet 

 places under the constant spray of little cascades, or running 

 water, where its clear glistening leaves are very conspicuous. It 

 has frequently been named Jung, hyalina by some of our most 

 acute and well practised hepaticists. 



6. Nardia compressa (B. Gr.), Carrington. Stem erect, branched, 



laterally compressed. Leaves succubous, two-ranked, orbiculatc, 

 compressed, subulate. Amphigastria sometimes present at the 

 points of young shoots. Calyx immersed among the involucral 

 leaves, mouth toothed. 

 Juugermannia compressa. Hook. Brit. Jung. t. 58 ; Sm. Engl. Bot. 

 t. 2587 ; Lindenb. Synop. Hep. p. 33. Mesophylla compressa, 



