156 NEMATOPHYCEJE. 



Wittr. Mon. QEdog., p. 13. Kirch. Alg. Schles, p. 52. Rabh. 

 Alg. Em*, lii., 349, in part. 



Prolifera Vaucherii, Le Clerc sur. Prolif. 474, t. 24, f . 4 ? 

 Vesiculifera Vaucherii, Hassall, t 50, f. 4. 



Britain. 



Plate LVII1. Jig. 8. CEdogonium Vaucherii, with oogonia and 

 spermogonia x 400. 



CEdogonium uxbicum. Wittr. Mon. (Edog. p. 13. 



Oogonia single, ellipsoid, opening by a pore above the 

 middle, oospores globose, not filling the oogonium, spermogonia 

 visually 2 celled, spermatozoids binate, supporting cells destitute 

 of chlorophyll. 



SIZE. Cells 016 mm. by 2|-, 6 times as long ; oospore 

 033--045 x 033--045mm. 



Kirch. Alg. Schles. p. 52. 



CEdogonium tumidulum, Prings. Beitr., p. 69, t. 5, f. 2 (not 

 Kutzing). Micr. Journ. 1866, p. 69. 



CEdogonium Vaucherii, in Rabh. Alg. Eur. iii., 349, in part. 



Ireland. 



Plate LIX. fig. 1. CEdogonium wlicum, with oogonium and spermo- 

 gonia x 400. 



1). Oospores ellipsoid or egg-shaped. 

 CEdogonium paludosum. (Hass.~) Wittr. Mon. (Edog. p. 14. 



Oogonia single, ellipsoid, usually rather oblique, opening by 

 a pore above the middle ; oospores ellipsoid, distinctly filling 

 the oogonium (membrane of the oospore, when mature, longi- 

 tudinally costate ?) ; spermogonia 1-8 celled, scattered, usually 

 situate in the upper portion of the filament ; spermatozoids 

 binate, often born with an oblique division. 



SIZE. Cells -015-'02 mm. by 3-7 times as long; oogonia 

 039--048 x -066--084 mm. ; oospore -036--045 x '054--063 

 mm. ; sperm, cell -Q14--016 x '006--013 mm. 



Vesiculifera paludosa, Hass. F. W. Alg. p. 199, t. 52, f . 3 ? 



England. 



Plate LIX. fig. 2. CEdogonium paludosum with oogonium and spermo- 

 gonia x 400. 



B. Oogonia furnished with verticillate median processes. 



a. Oospores subglobose. 

 CEdogonium Xtzigsohnii. D'Bary (Edog. p. 56, t. 3, /. 29-32. 



Oogonia single, ellipsoid, median processes 7-10, obtusely 

 conical, oogonia splitting round below the middle, opening by a 



