486 HEFATICjE, 



irregular. Antheridia embedded in the frond, cylindrical, hyaline ; 

 style projecting, hyaline. 



Dimensions. — Fronds about \ inch long by about \ inch 

 wide ; capsule '65 mm. diam. ; spores "08 mm. diam. 



Hab. — On very damp earth in fields, on wet banks, or 

 especially by the margin of ponds. Very rare. 



3. In a ditch near Deptford, Kent, Feiiccr, now extinct. 



4. Helford, West Norfolk, Rer. E. N. Bloouifidd, Aug. 18S1. 



5. Stoke-on-Trent, 11. Garner; Pottal Eeservoir, AVarwickshire, 

 /. E. BagncdJ. 7. Dolgelly, Merionethshire, /. Tlalf^, 18G3 ; 

 Aberffraw, Anglese}^ //'. IVUsoii. 8. Exposed mud banks of 

 reservoirs at Cropstone and Thornton, Leicestershire, F. T. Matt, 

 Aug. 1894. 9. Mere Mere, Cheshire, G. E. Hunt, 18G9. 

 13. Brownhall Orchard, Dumfries, /. Crn'u-k^hank ? 



Found on the Continent and in North America. 



Obs. — This rare and distinct species ma}' be distinguished 

 from M. (jlauca by its larger size, paler and 3'ellower colour, 

 spongy texture and its antical surface being pitted with, deep 

 cavities. 



It has been conjectured that it might be a terrestrial form of 

 Bicciocmyus nafan-s, but, in addition to its other distinguishing 

 characters, the spores are nearly twice as large and are leticulate, 

 not papillose. 



Description oe Plate CCXVII. — Figs. 1-4. Plants natural 

 size. 5. Frond x . G. Cross-section of frond x . 7. Ditto. 

 8. Portion of frond x. 9. Eootlets x. 10. Calyptra x. 

 11. Capsule X. 12. Style x. 13. Spores x. 14. Portion of 

 frond, showing styles of antheridia. 15. Styles of antheridia x 

 '(Lindenberg). 



