Simplest Forms of Life. 147 



Cells entirely or partly filled with chlorophyll, without admixture of 

 other coloring matter, color, pure green. (CHLOROPHYLLACEi«.) 

 Growth only or principally at the end 



of a filament consisting of a single branched 



cell, SiPHONEiE. 



of the cell family consisting of several, gener- 

 ally many cells, Confervace^. 

 Growth in eveiy direction, with division of all 

 individual cells, 

 propagation by swarm-spores, Palmellace.^. 

 propagation by still zygospores after copula- 

 tion. Conjugate.^. 

 Cells partly furnished with golden-yellow coloring 

 matter, besides chlorophyll, but covering the 

 latter, Diatomace^. 

 Cells likewise with blue or verdigris-green coloring 



matter, which hides the chlorophyll as above, Phycochromace^. 



ORDER I. SIPHONE^E. 

 Much elongated cells, growing at the ends, which branch by budding. 

 The branches likewise have terminal growth, cell-wall clothed uni- 

 formly with chlorophyll granules. Mostly salt water forms. Of the 

 family 



Vaucheriacece, Ktz., there are found living in fresh water and 

 upon moist ground, many species of the genus 



Vaucheria, D. C. Filamentous, at the base root-like, branched 

 cells without articulations. Only when spores are to be 

 produced do the ends of the branches become jointed. 

 There the swarm-spores originate. Besides these, resting- 

 spores are produced in short, lateral cells, near which are 

 the, usually hook-like, antheridia. The species are only to 

 be distinguished by their fructification. The following 

 are common : 



a. Oogonia and antheridia lateral, separated, near to- 



gether. 



V. sessilis, Lgb. Spores egg-shaped, sessile, the two near to- 

 gether, between them an antheridium of equal length, 

 hook-like, and bent. Very common. Forms loose, dirty 

 green, floating flocks. 



V. dic/wtoftia, Ag. Spores round, sessile, scattered or in 

 groups, with isolated antheridia. Filaments separated, 

 dichotomously branched. More robust than the former. 



b. Oogonia and antheridia together on lateral branches. 



