XIII.] ABOUT FUNGI. 1g! 
leaf, with the Peronospora mycelium ramifying among, 
and attacking, its cells. Pevonospora gangliformis 
attacks lettuces; FP. effusa is found on spinach; P. 
Schletdeniana is very destructive to young onions, and 
P. trifoliorum attacks the lucerne crops. So that here 
we have five species of one family preying upon and 
destroying man’s food. Puccinia gramints causes the 
“rust” so destructive to wheat, and P. afzz attacks 
the leaves of celery. We have elsewhere alluded to the 
evident polymorphism of this species 
and its connection with cidium 
(fig. 144). Cystopus candidus and 
Glesporium concentricum are destruc- 
tive to the cabbage tribe; 7richobasis 
fabe fatal to the growth of beans. 
The pear is attacked by Restelia 
cancellata; the plum by Puccinia prunorum, and other 
fruit trees suffer under the growth of various species. 
Ozdium (fig. 145) is the well-known Vine disease, 
and fig. 146 represents Erysiphe, the 
pea-blight. Many of our garden 
flowers are attacked by various 
species, among them roses, which 
suffer from at least four different 
species. Violets, anemones, orchids, 
hollyhocks, pelargoniums, sweet- 
williams, and ferns are among the 
victims of fungi in our gardens. 
A few years ago serious fears were 
entertained by horticulturists lest 
the whole race of hollyhocks should be destroyed 
by the ravages of Puccinia malvacearum, a species 
Fic. 145. 
