MESOCARPUS. 169 



5. MESOCAKPUS NUMMULOIDES Hass. 

 Plate XLY. Fig. 1. 



Char. Filaments of rather larger size than those of Meso- 

 carpus recurvus. Cells about six times as long as broad, 

 not usually recurved. Sporangia circular, and smaller than 

 those of M. recurvus. 



Sphcerocarpus nummuloides Hassall, in Annals of Nat. Hist. 

 vol. xii. p. 187. plate 7. fig. 12. 



Hab. Hertford Heath : A. H. H. 



This species approaches very closely to the following. 



6. MESOCARPUS PARVULUS Hass. 

 Plate XLV. Figs. 2, 3. 



Char. Filaments much shorter than those of Mesocarpus 

 nummuloides. Cells usually six times as long as broad. 

 Sporangia circular, small. 



Mougeotia parvula Hassall, in Annals of Nat. Hist. vol. xi. 

 p. 434. ; Sphcerocarpus parvulus Hassall, Annals, 

 vol. xii. p. 187. plate 7. figs. 13, 14. 



Hab. Hertford Heath, Epping, &c. : A. H. H. Near 

 Cross in Hand and Waterdown Forest : Mr. Jenner. 



The larger figure of the two may represent a distinct 

 species. 



7. MESOCARPUS OVALIS Hass. 

 Plate XLIY. Fig. 2. 



Char. Filaments about equal in size to those of Mesocarpus 

 parvulus. Cells ten or twelve times as long as broad. 

 Sporangia slightly elliptical, their long diameter being 

 placed in the direction of the length of the cells. 



Sph&rocarpus ovalis Hassall, in Annals of Nat. Hist, 

 vol. xii. p. 189. plate 7. fig. 15. 



Hab. Hertford Heath : A. H. H. Penzance : Mr. Rolfs. 



