112 BULLETIN OF THE BUSSEY INSTITUTION. 
conidia alone. What is called Ocvdiwm Tuckert in this country is 
nothing more than the conidia of Uncinula spiralis, and we have 
repeatedly received specimens bearing the former name, which had 
been exhibited at horticultural meetings and learnedly explained, with- 
out the slightest reference to the abundant perithecia, which clearly 
showed the species to be Uncinula spiralis. 
The species of Perisporiacee, to which order the grape mould just 
described belongs, were particularly abundant during the past summer, 
and several different species have been sent us with the information 
that they were doing great harm. From California we have received 
the form known as Oidium leucoconium, Desm., from Mr. D. Cleveland 
of San Diego, and Dr. H. W. Harkness of San Francisco. This 
form, which is in reality the conidia of Sph@rotheca pannosa, Lev., 
was common on peaches. This is not to be confounded with the 
fungus which causes the curling of the leaves of peach-trees, so com- 
mon in the eastern parts of the country. The latter fungus is Zaphrina 
(Ascomyces) deformans, Tul.; and, although it causes a whitish color 
to appear on the leaves, it is readily distinguished by the curling and 
thickening of the leaves. From Professor Bessey of Ames, Lowa, we 
have also received Spherotheca pannosa, which was common on culti- 
vated raspberries, and Mr. B. D. Halsted reports that the same fungus 
was common on gooseberries at Lansing, Michigan. At the latter 
place, Podosphera Kunzet, Lev., did considerable harm to the cherry- 
trees. 
During the past summer, Erysiphe graminis, was very abundant, 
in fact more so than we have ever seen before. It attracted the 
attention even of persons who were not interested in fungi. It appears 
also to have been common in California, from which State we have re- 
ceived specimens collected by Dr. H. W. Harkness. 
In the number of the Bulletin to which we have already referred, 
we expressed the view that the fungus found on orange and lemon 
trees in California did not derive its support directly from the bark 
and leaves of those trees, but rather from the remains and exudations 
of insects. Since then, we have received a letter from Dr. Wm. Hille- 
brand, who resided for a number of years at Honolulu, where the orange 
and lemon trees are covered with the same fungus as in California. 
Dr. Hillebrand writes: “ It [the fungus] is not the principal factor in 
the mischief produced; for this is owing to the woolly plant-louse, a 
