136 BOTANY. 



284. Upon coming into contact witli the germ-cell the 

 antherozoids mingle with it and disappear; the germ-cell 

 immediately begins to secrete a wall of cellulose ahout 

 itself, and it thus becomes a resting spore. After a period 

 of rest the thick waU of the resting spore splits, and through 



Pio. 63.— Keproduetion of Green Felt (Vauoheria sessilis). A. foi-mation of a 

 zoospore; B^ zoospore come to rest; C. zoospore germinating; D^ E, yoang 

 plants; w, root-like holdfasts; F, plant with sexual organs. Magnified about 30 

 times. 



the opening a tube grows out which eventually assumes 

 the form and dimensions of the full-grown plant. 



286. The Water-Moulds {Saprolegniacem) are colorless 

 saprophytes or parasites, more frequently the latter; they 

 are generally to be found in the water, attached to the 

 bodies of living or dead fishes, crayfishes, etc., or occasion- 

 ally in the moist tissues of animals out of the water. The 



