496 HEPATIC^. 



colorous, apex emarginate or obtuse ; radiculose when terrestrial 

 only, rootlets hyaline. Female flowers adnate to the postical 

 side of frond. Capsule globose, dark brown, coarsely reticu- 

 lated, the areolae 5, 6 across the convex side, walls dark brown, 

 thin, raised in a winged manner. 



Dimensions. — Fronds ^ to 2 inches long, 1" mm. wide, 'ii mm. 

 thick; capsule '7b mm.; spore "1 mm. 



Hab. — Floating on stagnant ponds, or on mud at their 

 margins. 



Somewhat rare. 



2. Strathfieldsaye, Hampshire, i/"///, 1855. 3. \\.Q\\i,Forsfer. 

 4, 5, 8. Pond near Ashley ; pond between Donington and the Trent, 

 Leicestershire, F. T. Mott. 9. Ashton Canal, h^nc,!. E. Smiderland; 

 Moston, Lanc.,i?. Lees ; Reddish Canal, Lane, G. A. Holt ; Mere 

 Mere, Cheshire, G. E. Hunt. 10. Hirst Courtney and Drax, 

 H. F. Parsons ; pond near PoUington, T. Birh,Jnnr. ; near Goole, 

 H. F. Parsons. 14. 



L Not unfrequent in ditches near the Shannon, Co. Limerick ; 

 by the side of the Bann River, above Drogheda ; still ditches near 

 Lough Neagh, where the canal joins the Lough at Lurgan, 

 Dr. D. Moore. 



Found on the Continent, North America, &c. 



Obs. — The fertile terrestrial form of this species is considered 

 by some writers to be a distinct species, but as it is only found 

 on mud at the margins of ponds where the floating form is found, 

 and where the ponds have become lower by dryness, I can only 

 conclude that whatever slight changes it may have undergone are 

 owing to the great difference in habitat to that of floating on 

 water, where it is always barren ; the terrestrial form is much 

 smaller, narrower, thicker, and more canaliculate. 



Description of Plate CCXXIV.^ — Fig. 1. Plants natural size 

 (Bischoff). 2. Ditto (Lindenberg). 3. Frond x ? (ditto). 4, 5. 

 Ditto (Bischoff). 6, 7- Cross-sections oF fronds x (Lindenberg). 

 8, 9. Ditto X 24 (Mere, Cheshire, Hunt). 10. Capsule x (Bischoff^). 

 11. Cross-section of frond showing capsule x (ditto). 12. 

 Spore x 290 (Barmouth, Dr. Carrington). 



