642 Proceedings of the Royal Irish Academy. 



if. 17-19. Jungermannia curta, Mart. Fl. Crypt. Erlang. p. 148^ 

 p. 148, t. 4, fig. 24; Lindenb. Synop. Hep. p. 56, n. 52; Nees, 

 Leber. Eur. 1, p. 214. Radula curta, Dumort. Syll. Jung, 

 p. 40. Scapania curta, Dumort. Rev. Jung. p. 14 (1835), ct 

 Hepat. Europ. p. 39 (1874); G. L. et 1^. Synop. Hep. p. 69 ; 

 Eabenhor. Hepat. Eur. exsic. n. 395, 196, 382; Cogn. Hepat.. 

 Belg. p. 22 ; Carring. Brit. Jung, part 4, p. 86, pi. 7, fig. 23. 



Hab. Moist shady banks, in woods, &c. Sillaghbraes and Sleemisb 

 Mountain, Co. Antrim ; Gleniff, Co. Leitrim ; Benbulben range, 

 Sligo. Abundant at Cromagiaun and other places about the Kil- 

 larney woods ; wet banks near the sea, on an island off BalKnakill 

 harbour, near Letterfrack, Co. Galway. This species and S. 

 umbrosa are often found together, when it is sometimes difficult 

 to define them. 



DiPLOPHYLLmi, Dumortier. 



Jungermannia, Mich. Xor. PI. Gen. p. 8, tab. 5, fig. 9 (1729) ; Linn. 



El. Suec, 1 ed., p. 335 (1745) ; Hook. Brit. Jung. (1816). Diplo- 



phyllum, Dum. Becueil, l,p. 15(1835). Scapania, Mitt, in Hook. 



El. Tasm. 2, p. 233(1858). 

 Involucre oligophyllous. Leaves conduplicate, bilobed. Colesule^ 



round, denticulate, peduncle inarticulate. Capsule qnadiivalved, 



naked. 



1. Biplophjllum alhica7is {lAmi.),DuTaoYt. Stems ascending. Leaves 



unequally 2-lobed, conduplicate, dorsal lobe ovate, ventral lobe 

 larger, oblong-ovate, both with a broad pellucid line in the mid- 

 dle. Colesule terminal, obovate, contracted at the mouth, and 

 toothed. 



Jungermannia albicans, Linn. Sp. PI. p. 1599; Hook. Brit. Jung, 

 ^t. 23; Engl. Bot. t. 2240 ; G. L. et X. Synop. Hepat. p. 75 ; Ea- 

 benhor. Hepat. Europ. exsic. n. 13, &c. Diplophyllum albicans, 

 Dumort. Rev. Jung. p. 16; Hepat. Europ. p. 48; Cogn. Hepat^ 

 Belg. p. 25. 



Hab. Moist banks, and in shady woods, &c. This is probably the most 

 widely diffused and commonest species in Ireland. It varies 

 much in size and appearance, according to the localities where it 

 grows. 



2. BiplophyUimi oltusifolium (Hook.), Dumort. Dioecious. Stems 



simple, ascending. Leaves bif arious, conduplicate, unequally lobed, 

 lobes falcate, rounded at the apex. Colesule terminal, plicate 

 towards the apex, which is contracted and toothed. Antheridia 

 in the axils of the perigonial leaves, on the upper portion of the 

 male plant. 

 Jungermannia obtusifolia, Hook. Brit. Jiing. t. 26 ; Smith, Engl. 

 Bot. t. 2311 ; Lindenb. Synop. Hepat. p. 60; Dumort. Syll. 

 Jung. p. 46 ; Ekart, Synop. Jung. p. 30, t. 7, fig. 37, • 



