(EDOGONIACE.E. 173 



(Edogonium czassum. (Kass.~) Wittr. Gotl. Sotv. Alg. p. 20, t. 1. 



/. 4-6. 



Oogonia single (rarely twin), obversely egg-shaped ellipsoid, 

 a little swollen, opening by a pore above the middle ; oospores 

 ellipsoid, not filling the oogonia. 



SIZE. Cells -033--055 mm. 2-5 times as long ; oogonia 

 065--07 x -1--125 mm. ; oospore '06--066 X 'OS-' 11 mm. 



Wittr. Mon. (Edog. p. 43. Kirch. Alg. Schles. p. 59. 



Vesiculifera crassa Hass. Alg. t. 51, f. 1. 



Plate JjXVl. fig. 2. (Edogonium crassum, with oogonium x 400. 

 (Edogonium subgetaceum. Kutz. Spec. p. 368. 



Basal cell dilated and discoid at the base, rather lobed, 

 terminal joint obtuse ; oospores broadly oval, golden red, closely 

 involved in the oogonium. 



SIZE. Cells -04--052 mm. equal or twice as long ; oogonia 

 065 x '055 mm. ; oospore '06 x -05 mm. 



Kutz. Tab. iii, t. 41, f. 1. Kabh. Alg. Eur. iii, 352. 



Deeside (Scotland). 

 Plate LXVI. fig. 5. (Edogonium subsetaceum, with oogonium x 400. 



GENUS 65. BUX.BOCHCETE. Ag. (1817.) 



Filaments articulated, branched, joints thickened upwards, at 

 or about the apex bearing seta?, which are straight, hyaline, 

 colourless, more or less elongated, bulbous at the base, cell 

 membrane usually punctate ; oogonia opening by a lateral pore 

 above the middle ; mature oospore red ; monoecious or 

 dioecious. 



Reproduction sexual as in (Edogonium. In the dioecious 

 species nannandrous (dwarf males). 



The following arrangement of the British species is based on that of 

 Prof. Wittrock : 



BULBOCHCETE. 



Sect. 1. Oogonia globose or subglobose, patent ; oospores with the same 

 form, and filling the oogonia. Dioecious. 



A. Dwarf males unicellular. 



None. 



B. Dwarf males licellular. 



a. Basal cell of the stem of the male plants shorter than the 

 spermogonia. 

 B. intermedia, DBary. 

 B. polyandra, Cleve. 

 B. Brebissonii, Kutz. 

 B. setigera, Ag. 



