262 THE VEGETABLE WORLD. 
vine is only another species of Erysiphes, which forms the two 
first evolutions only of the reproductive organs: 
The organs of vegetation in the Erysiphes consist of a mycelium 
formed of fine thread-like filaments, furnished with spores the form 
and functions of which remind us in many respects of ‘the suckers 
of the Dodder-plant; which leads to the inference that in these 
fungi we see parasites which live upon the green or living parts 
of vegetables, particularly upon the leaves. Certain filaments of 
the mycelium bear straight branches more or less numerous, 
which swell at the extremities into ellipsoidal utricles, and eon- 
stitute small organs, often in the form of a chaplet of beads, formed 
Fig. 329.—Reproductive Organs of Eresyphus (Conidia). 
of reproductive cells, analogous to the fugitive buds of ee 
plants. To this first reproductive system M. Tulasne gives a 
name of Conidies (Fig. 329). ee. ae 
Another class of organs consists of spherical or ovoid vesicl® 
generally pedicellate, and filled with innumerable small ~ a 
oblong corpuscles. This second system, represented in Fig. oe" 
he calls Pycnides. oS a 
Such are the two sorts of reproductive organs which constitute 
the Oidium. Tuckeri of Berkeley ; which is, however, only n°" 
the Erysiphes, the last and perfect form of which has not yet — 
loped itself. a 
mat 
