CEDOGONIACE^E. 169 



SIZE. Cells : fern. Q2- 1 027 mm. 3-5 or 8 times as long ; 

 oogonia -055--057 x -075--OS mm.; oospore '049--051 x 

 065--069 mm. 



Kirch. Alg. Schles. p. 58. Archer in Quart. Journ. Micr. 

 Sci. 1866, p. 69. 



(Edogonium gemelliparum, Pringsh. Beitr. p. 71. 



Ireland. 



Plate LXIV. fig. 2. (Edogonium Landsborottghii, variety gemelli- 

 parum, with oogonium x 400. 



(Edogonium rivulare (Le Cle.rc). Braun, Cliytr.p. 23, t. I,/. 1-10. 



Oogonia single, or 2-7 continuous, obversely egg-shaped, 

 opening by a pore above the middle; oospores obversely egg- 

 shaped, rarely ellipsoid or nearly globose, not by a long way 

 filling the oogonia ; male plants a little slenderer than the 

 female ; spermogonia 3-9 celled ; spermatozoids binate. 



SIZE. Cells : fern. -045-'045 mm. 3-8 times as long; cells: 

 male -03--036 mm. 4 times as long ; oogonia '07- f 085 x -13--16 

 mm. ; oospore -055-'07 X '065-' 1 mm. ; sperm, cell '021-'028 x 

 014--016 mm. 



Wittr. Mon. CEdog. p. 36. Kirch. Alg. Schles. p. 58. 

 Rabh. Alg. Eur. iii. 350 in part. 



Prolifera rivularis, Le Clerc Prolif. 472, t. 23, f. 1. 



Scotland. 



Plate LXIV Jig. 3. (Edoyo?iium rivulare, with oogonium and oospore 

 x 400. 



Species of which the organs of fructification are imperfectly 



known. 



a. Oospores globose or sub-globose. 

 (Edogonium delicatulum. Kutr. Tab. in., t. 33, /. 3. 



Pallid, basal cell scarcely lobed at the base, affixed, cells 

 cylindrical; oogonia subglobose, inflated, a little extended at 

 either pole ; oospore perfectly globose. 



SIZE. Cells I 005-'006 mm., 3 times as long ; oogonia '02 x 

 017 mm. ; oospores 012--014 mm. 



Rabh. Alg. Eur. 355. Rabh. Alg. Ex. No. 1156. 



Deeside (Scotland). 



Plate LX VI. Jig. 7. (Edogonium delicatulum, with oogonia x 400. 

 (Edogonium tenellum. Kutz. Tab. in., t. 33, f. 9. 



Basal cell two to three lobed, at first fixed, terminal joint 

 obtuse, cells cylindrical or rather clavate ; oogonia very much 

 inflated; oospore globose, bright orange. 



