156 BOTANY. 
spores, and of the latter there are in most cases two or three 
different kinds, which are produced earlier than those that 
result from a fertilization. 
324. The sexual organs and the spore-fruit resulting from 
the act of fertilization bear a striking resemblance to those 
of Coleochete, the difference being such as may be ac- 
counted for by taking into consideration the aquatic habits 
Fra, 78. : Fie. 79. 
Fia. 70.- Grape-blight (Erysiphe). a, apiece of a vegetative hypha, m, m, 
upon. a fragment of the ig eae of the leaf of the grape, and to which it is fas- 
tened by the suckers, h; 
unified 370 times. 
Fie. 79.—Grass-blight (Erysiphe communis). a, vegetative filaments, with a 
few suckers; b, branches bearing conidia; c, separated conidia. Magnified 135 
times. 
hypha, with the suckers, h, seen in side view. Mag 
of the one and the aerial and parasitic or saprophytic habits 
of the other. 
325. In the Blights, which are all parasitic, the jointed 
filaments closely cover the leaves and other tender parts of 
their hosts, and draw nourishment from them by means of 
suckers, which project as irregular outgrowths from the 
side next to the epidermis (Fig. 78). These suckers apply 
themselves closely to the epidermal cells, and, in some 
cases, appear to penetrate them. 
