210 



ChlorococeinesR 



Sub-family CHLOROCHYTRIE.E. As here constituted this group includes 

 the genus Chlorococcwm and those Algse which have been placed for some 

 time past in the ' Enclosphseraceae.' All of them are characterized by 

 the rounded or ellipsoidal nature of their cells or coenocytes, which are for the 

 most part endophytic. 



Fig. 137. A, Chlorochytrium Lemiise Cohn ; a, part of leaf of Lemna trisulca, with three 

 Chlorochytrium-cells ; a young cell showing pyrenoids, a fully-developed one, and an empty 

 one ; b, gamete ; c, zygozoospore ; a, x 360 ; b and c, x 720. B, Chlorochytrium biennc 

 (Klebs) G. S. West; a, a large winter resting-cell which has divided into many cells; b, one 

 of the cells; c, formation of gametes in this cell; d, gamete ; e, zygozoospore ; a d, x 800 ; 

 e, x 720. (7, Phyllobium dimorphum Klebs ; a, empty resting-cell ; b, microgamete ; c, mega- 

 gamete ; d, fusion of anisogametes ; e, zygozoospore ; /, germination of zygozoospore ; 

 </, young Phyllobi urn-cell ; a, x72; b g, x 720. D, Chlorochytrium Cohnii (Wright) G. S. 

 West ; a, vegetative cell ; b, gamete ? ; c and d, development of motile cells ; all x 450. 

 E, Chlorochytrium paradoxum (Klebs) G. S. West ; a, resting-cell which has formed zoo- 

 gonidia (b), x 360 ; c e, germination-stages, x 720. (D, after Lagerheim ; remainder after 

 Klebs, from Wille.) 



The best known genus is Chlorochytrium (fig. 137 A and B ; fig. 138 A), the 

 cells of which are ellipsoid, ovoid, or somewhat irregular, occurring either in 

 the intercellular spaces or wedged in between the peripheral cells of aquatic 

 macrophytes (CeratophyUum demersurn, Elodea canadensis, species of Lemna) 

 and plants which grow in damp situations (Mentha, aquatica, Rumex obtusi- 

 folius, Lychnis Flos-cuculi, etc.). Some species are marine, occurring in the 



