CEDOGONIACE.E. 167 



036--045 mm. ; oospore -02S--035 X -028--034 mm. ; sperm, 

 cell -01--015 x -006--009 mm. 



Kirch. Alg. Schles. p. 57 ; Rabli. Alg. iii. 348. Rabh. Alg. 

 Ear. No. 790; Wittr. Mon. (Edog. p. 33, t. 1, fig. 16-17. 



CEdogonium Nordstedtii, Wittr. CEdog. Nov. 6, t. 1, f. 7-8. 



Britain. 



Plate LXIII. fig. 2. CEdogonium Pritigsheimii, with oogonia x 400. 

 (Edogonium punctato-striatum. De Bary CEdog. t. 2,f. 15-16. 



Oogonia single, depressedlj globose, manifestly splitting 

 round (circumscissile) in the middle, opening by a pore in the 

 fissure ; oospore depressedlj globose, nearly filling the oogonia ; 

 male plants a little slenderer than the female ; spermogonia 3-7 

 celled; spermatozoids single; membrane of the vegetative cells 

 and of the oogonia spirally punctate ; basal cell depressedly glo- 

 bose ; membrane vertically plicate. 



SIZE. Cells: fern. -018-'022 mm. 2-6 times as long; cells : 

 male 'OlG-'Ol^ mm. 2-6 times as long; oogonia > 048-'05o x 

 038-*048 mm.; oospore '044-'051 X '035--043 mm. ; sperm. 

 cell -016--018 X -006--01 mm. 



Barker. P., in Quart. Jonr. Micr. Sci. 1871, p. 94 ; Rabh. 

 Alg. iii. 354. Rabh. Alg. Sachs. 214. Wittr. Mon. (Edog. p. 

 34. Rabh. Alg. Eur. No. 2276. Kirch. Alg. Schles. p. 57. 



Ireland. 



Distinguished by the cell wall being marked by spiral striae of a dotted 

 character, finely and closely set ; these seen in an empty cell, through 

 and through, the upper and lower striae being nearly in focus simul- 

 taneously produce a somewhat decussate appearance. 



Plate LX1I1. fig. 3. CEdogonium punctato-striatum, with oogomum 

 x 400. 



bb. Oospores ellipsoid or egg-shaped. 

 (Edogonium Boscii (Le Clerc}. Wittr. Lisp. CEdog. Suec.p. 136. 



Oogonia single, rarely twin, oblong -ellipsoid, opening by a 

 pore above the middle ; oospores ellipsoid, by no means filling 

 the oogonia, longitudinally costate ; male plants the same or 

 nearly the thickness of the female ; spermogonia 3-6 celled ; 

 spermatozoids binate; terminal cell slender and somewhat 

 hyaline. 



SIZE. Cells *014-'02 mm. 4-6 times as long; oogonia 

 04--045 x -08--1 mm. ; oospore -036--04 x -06--065 mm. ; sperm, 

 cell 013--014X-006--009 mm. 



Wittr. Mon. (Edog. p. 34. Rabh. Alg. Eur. iii. 357, Rabh, 

 Alg. Eur. No. 2198, 2369. 



