i58 HEPATIC^. 



broadest part of the elaters ; elaters pale brown, bispiral, attenu- 

 ated at both ends. Male plant usually shorter and crisped 

 at the margin, 4 to 16, roundish-oval, slightly pedicellate, 

 antheridia imbedded in the antical side of the roundish, simple 

 or bilobed processes. 



Fruits in Spring. 



Var. denfici'Iafa, N. 



Fronds smaller than the usual form, simple, linear, margin 

 denticulate. 



Dimensions, — Fronds |- to Ih inch long, by 5" mm. to 10' 

 mm. broad, "4 mm. to '5 mm. thick near the middle ; cells 

 •05 mm. X "05 mm., "05 mm. x "06 mm. ; calyptra 5" mm. 

 to 7' mm. long x 1*5 mm. broad ; pedicel 1 inch long; valves 

 1*2 mm. X '4 mm. ; spores "03 mm. ; elaters '25 x '015 mm. 

 near the middle. 



Hab. — In damp places, ditches, bogs, or on wet rocks. 



Common. 



1-3. 5,G. 7-12. 14-16. I. 



Europe, North America, Cuba. 



Yar. denticulata, N. Creeping amongst mosses, frequent in 

 limestone districts. 



Obs. — A distinct species, and not likely to be mistaken for any 

 of the other frondose ones ; distinguished by its thick, nerveless, 

 tiesh}^ fronds, which are brittle when wet and have a greasy feel, 

 like the leaves of Pinguicula vulgaris ; its usually larger size and 

 smooth calyptra separate it from the other British species of the 

 genus. 



Descriptiox of Plate CCIV. — Figs. 1-3. Plants, natural 

 size (after Hooker). 4. Frond, postical aspect with involucres 

 slightly magnified (ditto). 5. Cross-section of frond x 16 

 (Closter, Austin). 6. Cross-section of involucre magnified 

 (after Hooker). 7. Cross-section of young calyptra, magnified 

 (ditto). 8. Cal3^ptra, magnified (ditto). 9. Capsule, magnified 

 (ditto). 10. Capsule opened, magnified (ditto). 11. Portion 

 of male frond, magnified (ditto). 12. Male receptacle, magnified 

 (ditto). 



