149 BOTANY. 
Germination then takes place, in some species by the pro- 
duction of a tube, in others by the division of the proto- 
Fria. 70.—Resting spores of White Rust of Peppergrass; at A, still surrounded 
py ogous. B, C, formation of zodspores; D, free zodspores. Magnified 400 
es. 
plasm into zoéspores (Fig. 70, B, C,.D) whose subsequent 
development is like that described above in case of the 
conidia. 
Practical Studies.—(a) Collect a quantity of Green Felt and pre- 
serve itin a dish of water. After a few hours a large number of z06- 
spores may be observed collected at the edge of the water nearest to 
the light. 
(0) Examine carefully mounted specimens of the bright-green fila- 
ments, and look for the thickened lateral branches which produce 
the zodspores. 
(ce) Select some of the oldest, yellowish filaments. Mount and ex- 
amine with a low power for the sexual organs. In collecting speci- 
mens for the study of the sexual organs it is necessary always to 
take those masses which are yellowish and appear to be dying or 
dead. 
(ad) Throw a dead fish into a pool of water in the summer, and ex- 
amine it after a few days, when it will probably be found covered 
with a mould-like growth. Remove a few filaments and look for 
the formation of zodspores. The same Water mould (Saprolegnia 
ferax) may often be found upon the bodies of young fishes, especially 
in fish-hatching houses, 
(e) In the latter part of summer and in the autumn, examine the 
dead flies which adhere to window-paues, door-casings, and especially 
