THE SMALLER FUNGI. 637 
or blights” are due to sundry other hyphomycetes or thread- 
like smaller fungi, which, equally abroad and in this country 
seriously affect the leaves and fruits, and seed-vessels of 
various living plants. Of these mention has been made 
of the Hrysiphe when noticing the dimorphism of certain 
fungi, and the list of plants to which the several species of 
this injurious little fungal growth and of its allies attaches 
itself, would be perhaps about the same at home or abroad. 
Any one who has had to do with the greenhouse kept at a 
low temperature, with the plant propagating house, or with 
the culture of the parlor plants, must be familiar with the 
rose-leaf mildew, especially when it so suddenly attacks the 
finer and tender sorts of the tea roses; and will recognize 
in the following description this insidious pest: “The first 
Species in our enumeration is found on cultivated roses. 
What a deplorable picture does a favorite rose-bush present 
When attacked by this mildew! The leaves blistered, puck- 
cred and contorted; their petioles and the peduncles and 
calyces of the flowers swollen, distorted, and gray wit 
mould, and the whole plant looking meh 
80 diseased and leprous that it needs 
no mycologist to tell that the rose 
is mildewed. This species is the 
Spheerotheca pannosa of Léveillé.” 
(pp. 165, 166.) The hop mildew 
abroad is an allied species, the ha- 
zel, oak and beech mildew attacks 
the alder leaves here in Phyllactinia 
Juttata; the English willow blight is here found “common 
on living leaves” (Curtis) ; the foreign barberry mildew, 
Microspheria, is here under several species ; the common 
White mildew, Erisyphe communis (Fig. 5; % sia 
of buttercup blight x 80, Æ. communis; 6, — ae 
the same, highly magnified. From Cooke), is so ome 
that it well deserves the name; the singular bristle mould, 
Cheetomium chartarum, attacks wet paper here as well as 

