PARASITIC FUNGI AND MOULDS. 41 
the same French name, Pourridié, which is found 
in the south of France, and has been studied by 
Planchon and Millardet. These naturalists describe 
it as formed by the rhizomorphous mycelium of 
a large hymenomycetous fungus, Agaricus melleus. 
Resleria is very different. It isa small white fun- 
gus, with a white or ash-coloured head, from eight 
to ten millimétres in size, of which the mycelium 
lives in the interior of the vine-roots, penetrating 
and profoundly affecting all the tissues of the roots, 
and producing in the autumn the fructification which 
comes to the surface. ; 
It is generally developed in marly and argillaceous 
soils, after a rainy season, and in the low-lying parts 
of vineyards on the slope of a hill. It thrives in 
the moisture which lies below the surface of the soil, 
and it is therefore important to improve the con- 
dition of those sub-soils which are impermeable. 
It is also necessary to separate the stocks, so as 
to prevent their roots from interlacing, and to uproot 
and burn diseased vines, since the fungus may subsist 
for several years in dead and dried roots. If, which 
is almost always the case, any fragments of roots 
remain in the ground, they will reinfect the sound 
stocks which have been substituted for them. 
Remarks on Diseases of the Vine—We may be 
surprised that this valuable plant, which has been 
so carefully cultivated in France, should be attacked 
by such a number of parasites, both animal and 
