318 



FAMILY PALMELLE/E 



-HiEMATOCOCCUS. 



subdivision of their contents. Besides increasing in the ordinary 

 mode of binary multiplication, the Palmella-cells seem occasionally 

 to rupture and diffuse their granular contents through the gela- 

 tinous stratum, and thus to give origin to a whole cluster at once, 

 as seen at e, after the manner of other simple Plants to be pre- 

 sently described (§ 241), save that these minute segments of the 

 endochrome, having no power of spontaneous motion, cannot be 

 ranked as ' zoospores.' The gelatinous masses of the Palmellese are 

 frequently found to contain parasitic growths formed by the ex- 

 tension of other plants through their substance ; but numerous 



Fig. 146. 



Hcematococcus sanguineus, in various stages of development: — 

 a, single cells, enclosed in their mucous envelope ; b, c, clusters 

 formed by subdivision of parent-cell ; d, more numerous cluster, 

 its component cells in various stages of division ; e, large mass 

 of young cells, formed by the subdivision of the parent-endo- 

 chrome, and enclosed within a common mucous envelope. 



branched filaments sometimes present themselves, which, being 

 traceable into absolute continuity with the cells, must be consi- 

 dered as properly appertaining to them. Sometimes these fila- 

 ments radiate in various directions from a single central cell, and 

 must at first be considered as mere extensions of this ; their ex- 

 tremities dilate, however, into new cells ; and when these are fully 

 formed, the tubular connections close-up, and the cells become 



