CEDOGONIACE.E. 155 



CEdogonium vernale. (Hass) Wittr. Man. (Edog.p. 10. 



Oogonia single, obversely egg-shaped or globose, opening 

 with an operculum, fissure narrow, oospores globose, not filling 

 the oogonium, spermogonia bicellular, sub-epigynous. 



SIZK. Cells -010-016 mm. by 4^-6 times as long ; oogonia 

 339--045 x -045--051 mm. ; oospore '034--038 x '034--039 

 mm. ; sperm, cell -01--012 x 'OOS--009 mm. 



Vesiculifera vernalis Hass. F. W. Alg. p. 434. 



Vesiculifera Candollei Hass. F. W. Alg. p. 208, t. 52, f. 9. 

 Eabh. Alg. Ear. iii. 355. 



England. 



Plate LVI1I. fig. 6. (Edogonium vernale with oogonia and spermo- 

 gouia x 400. 



CEdogonium ciispum. (Hass) Wittr. Non. CEdog.p. 10. 



Oogonia single, obversely egg-shaped or globose, opening 

 with an operculum, fissure narrow; oospores nearly globose, not 

 filling the oogonium ; spermogonia 2-5 celled, hypogynous, or 

 sub-epigynous ; spermatozoids binate, terminal cell obtuse. 



SIZE. Cells -01 2-'018 mm. 2-4-L times as long; oogonia 

 037--049 x -042--054 mm. ; oospore -033--046 x '034--046 

 mm. ; sperm, cell -009--014 X '007--012 mm. 



Kirch. Alg. Schles. p. 52. 



Versiculifera cnspa, Hass. F. W. Alg. 203, t. 52, f. 8. 



(Edogonium rostdlatum, Prings. Beitr. p. 69, t. 5, f. 1 ; 

 Archer Quart. Journ. Micr. Sci., 1867, p. 79 ; Rabh. Alg. Eur. 

 iii, 347. 



CEdogonium pidchellum, Braun. Rabh. Alg. Eur. 2095. 



Britain and Ireland. 



" This is one of several monoecious species, but it is also characterized 

 by the oogonium not opening by a pore or aperture formed in its wall, 

 for the admission of the spermatozoids, as is usual in this genus, but by 

 a circuniscissile dehiscence. From the cleft so produced an inner mem- 

 brane projects, which seems to be itself perforate." Archer. 



Plate LVlIl.fig. 1. CEdogonium crispum with oogouia x 400. 

 CEdogonium Vauchexii. (Le Clerc.) JBraitn. Chytr, t. 2, /. 13. 



Oogonia single, obversely egg-shaped, or globose, or nearly 

 globose, opening by a pore above the middle ; oospores globose 

 or nearly globose, not completely filling the oogonium ; spermo- 

 gonia 2-4 celled, sub-epigynous or hypogynous, spermatozoids 

 binate. 



SIZE. Cells '02--03 mm. 1^-4 times as long; oogonia 

 04--055 x -045--065 mm. ; oospore -035--05 x -035--052 mm. ; 

 sperm, cell -017--024 x -006--011 mm. 



z 



