160 NEMATOPHYCE^J. 



(Edogonium undulatum. (Breb.) Br. in De Bary CEdog. p. 94-. 



Oogonia single or twin, ellipsoid-globose, or nearly globose, 

 opening by a pore below the middle ; oospores ellipsoid-globose, 

 or nearly globose, nearly rilling the oogonia ; vegetative cells 

 four times undulatingly constricted ; terminal cell (which some- 

 times is the oogonium) obtuse ; dwarf males obconical, seated 

 on the supporting cells. 



SIZE. Cells -015--017 mm., 3-5 times as long ; oogonia 

 051--056 X -057--075 mm. ; oospores -046--05 X '04S--06 

 mm. ; dwarf males, -009--01 X '0. 



Wittr. Mon. CEdog. p. 20. Kirch. Alg. Schles. p. 54. 

 Rabh. Alg. Eur. iii. 351. 



Conferva undulata, Brebisson. 



Cymatonema confervaceum, Kutz. Tab. iii., t. 47, f. 1. 



Scotland. 



Plate LIX. fig. 9. CEdogonium undulatum with oogonia and dwarf 

 male x 400. 



(Edogonium Reinschii. Roy MSS. 



Mr. Roy has announced that the Cymatonema figured by 

 Reinsch (Contrib. t. 6, /. 7) has been found in Scotland, and 

 is a genuine (Edogonium, but no further details have tran- 

 spired, and we know nothing of the fructification. The sterile 

 cells are figured on Plate LVII. fig. 23. 



B. Dwarf males bicellular, spermogonia internal. 



CEdogonium depressum. Prings. Beitr. 69, t. 5, /. 5 



Gynandrosporous. Oogonia single, depressedly globose, 

 opening by a pore at the middle. Oospores depressedly 

 globose, not filling the oogonia ; androsporangia 2-celled ; 

 dwarf males oblong, obversely egg-shaped, one-third part 

 shorter than the oogonia on which they are seated. 



SIZE. Cells > OOS-'OG9 mm., 3-6 times as long; oogonia 

 028 X '026 mm. ; oospores -023 X '017 mm. 



Wittr. Mon. (Edog. p. 21. Kirch. Alg. Schles. p. 54. 

 Rabh. Alg. Eur. iii. 349. 



Vesiculifera cequale, Hassall, t. 53, f . 3 ? 



Scotland. 



Plate LX.Jig. 1. (Edogonium depressum with oosporangia, oospores, 

 dwarf males, and bicellular anclrosporaugia x 400. 



C. Dwarf males bimulticeUular, spermogonia external. 



a. Oospores with smooth membrane. 



Oospores globose or subglobose. 



(Edogonium flavescens. (Hass.) Wittr. Disp. CEdog. p. 127 

 Idio-androsporous. Oogonia single, egg-shaped-globose 



