82 



Cfilorophycece 



pore to admit the antherozoids. On fertilization the oospore 

 develops a brick-red colour and a thick cell-wall, but it does not 



ii 



1 



a 



, -_ . .^. 



. ." o ?-\* 



Fig. 26. A D, Cylindrocapsa involuta Reinscb (x480). a, antheridium ; an, 

 antherozoid ; oo, oogonium. (After Cienkowski.) E and F, C. conferta 

 West, from Bowness, Westmoreland (x520j. 



fill the oogonium. The method of sexual reproduction was worked 

 out by Cienkowski 1 . 



Genus Cylindrocapsa Reinsch, 1867. The thallus consists of 

 unbranched filaments of cells, each cell having a thick lamellose 

 cell-wall. The filaments are encased in a thick lamellose sheath, 

 and they greatly resemble certain of the more gelatinous stages 



1 Cienkowski in Bull, de 1'Acad. Imp. St Petersbourg, torn, xxii, 1876, pp. 549 

 555, t. ii, f. 5065. 



