136 BOTANY. 
284, Upon coming into contact with the germ-cell the 
antherozoids mingle with it and disappear; the germ-cell 
immediately begins to secrete a wall of cellulose about 
itself, and it thus becomes a resting spore. After a period 
of rest the thick wall of the resting spore splits, and through 
Fie. 63.—Reproduction of Green Felt (Vaucheria sessilis). A. formation of a 
zodspore; B, zodspore come to rest; C. zodspore germinating; D, EH, young 
plants; w, root-like holdfasts; 7, 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. 
285. The Water-Moulds (Saprolegniacee) 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 
