CARPOPHYTA. 157 
826. The crossing and branching filaments soon send up 
many vertical branches, in which partitions form at regular 
intervals. The cells thus formed are at first oblong and 
cylindrical, with flattened ends; but the topmost one soon 
becomes rounded at its extremities, and the others follow 
in quick succession, thus giving rise to a row of cells, the 
spores, or conidia (Fig. 79). These fall off and germinate 
at once by pushing out a tube, which gives rise to a new 
plant. 
327. The sexual process in most species takes place late in 
the season. Two filaments crossing each other or coming 
Fie. 80. 
Fie. 80.—The sexual process in a Blight (Erysiphe). a, jointed threads; b, 
antherid; c, carpogone; d, young spore-fruit; e, older spore-fruit. Magnified. 
Fie 81.—Ripe spore-fruit of Willow-blight (Uncinula adunca). The append- 
ages are curved or hooked. Magnified. 
into close contact swell slightly and send out from each a 
short branch; one of these becomes the carpogone (c, Fig. 
80). From the swollen part of the other filament a corre- 
sponding branch is given off, which grows up in contact 
with the carpogone and becomes the antherid (0, Fig. 80). 
$28. Fertilization at once takes place, by the direct union 
of protoplasm. Eight or ten branches grow out just below 
the carpogone, and growing upward soon completely cover 
it with a cellular coat which eventually becomes hardened 
and turns brownish in color, constituting the pericarp of 
the spore-fruit (Fig. 81). 
