162 NEMATOPHYCE^E. 



(Edogonium crassiusculum. Wittr. Disp. (Edog. p. 132. 



Gynandrosporous. Oogonia single, or twin, globose egg- 

 shaped or nearly globose, opening by a pore above the middle ; 

 oospores ellipsoid-globose or globose ; membrane very thick, 

 almost filling the oogonia ; androsporangia 2-5 celled ; dwarf 

 males nearly straight, seated on or about the supporting cells ; 

 spermogonia 1 (?) celled. 



SIZE. Cells -027-*03 mm., 3J to 5 times as long ; oogonia 

 054--06X-06--075 mm.; oospore '051--057 x -052--063 mm. ; 

 androsp. cells '026--028 x -01--018 mm.; sperm, cell -007--009 

 mm. 



Wittr. Mon. (Edog. p. 24. 



Epping Forest (1882). 



We have only found this species once in pools on the Loughton side 

 of Epping Forest, but the very thick coat of the oospore is remarkably 

 distinct, combined with other characters, so as to render its determina- 

 tion certain. 



Plate LX. jig. 5. (Edogonium crassiusculum with oogonium and 

 dwarf males j , androsporangia ; o, mature oospore X 400. 



b. Oospores ellipsoid or egg-shaped. 

 (Edogonium Borisianum. (Le Clerc.) Wittr. Disp. (Edog. p. 132. 



Gynandrosporous (or idio-androsporous ?). Oogonia single 

 or twin, obversely egg-shaped, opening by a pore above the 

 middle ; oospores obversely egg-shaped, almost filling the 

 oogonia ; supporting cells swollen ; androsporangia 2 ? celled, 

 terminal cell (which sometimes is the oogonium) obtuse, dwarf 

 males a little curved, seated on the supporting cells ; spermo- 

 gonia unicellular. 



SIZE. Cells -015--021 mm., 3-5 times as long ; supporting 

 cells -03-'033 mm., twice as long ; oogonia -045-'05 x *06-'075 

 mm.; oospore -04-'044 x < 051-'054 mm.; androsp. cell '017- 

 018 x '015--02 mm. ; sperm, cell -01 x '021 mm. 



Wittr. Mon. (Edog., p. 25. Kirch. Alg. Schles. p, 55. 



Prolifera Borisi'.ma, Le Clerc Prolif. 175, t. 23, f. 6. 



(Edogonium apophysatum, Braun, in Kutz. Sp. Alg. p. 366. 

 Kutz. Tab. Phy. iii., t. 35, f. 5. Rabh. Alg. Ear. iii., 251. 



(Edogonium setigemm, Vaup. lagt. (Edog. 17, t. 1. Archer 

 in Quart. Journ. Micr. Sci. 1866, p. 69. 



Britain, Ireland. 



See Mr. Archer's detailed account of this species in the place above 

 quoted. 



Plate LX. Jig. 6 (Edogonium Borisianum, with oogonium and 

 thickened supporting cell bearing the dwarf males; a, androspore 

 x 400. 



