62 BOTANICAL GAZETTE. [ March, 
9. Erysiphe tortilis (Wall.) Lk. 
On Clematis Virginiana. Our specimens are amphigenous, 
as given also in Bessey’s notes. Spores generally 4, often 5 and 
6. With these two exceptions the description of Cooke corre- 
sponds with our specimens. The plants on which this mildew 
were growing were in a very sickly condition. 
10. Erysiphe lamprocarpa (Wall.) Lév. 
On Cnicus altissimus, var. discolor, Verbena urticifolia, Am- 
brosia artemisizefolia, Helianthus doronicoides, H. annuus, Acti- 
nomeris squarrosa, Vernonia fasciculata, Eupatorium perfoliatum, 
Solidago Canadensis. This is one of our most common and best 
known mildews. The conidial stage occurs in the early part of 
summer and lasts until fall. 1e mycelium is generally very 
abundant, covering the foliage with a whitish web-like mass. 
The last six hosts are not given in any of the lists to which I 
have had access. 
11. Erysiphe communis ( Wall.) Schl. 
On some Anemone and Ranunculus abortivus. Our Anemone 
specimens give the following points: Perithecia abundant on 
petiole and blade above and below, very dark brown. Append- 
ages 10 to 15, sometimes very long, lower half slightly colored, 
tips clear. Asci 3 to 4: spores 3 to 5, mostly 4. Perithecia 
quite variable in size, reaching .11 mm. in diameter. This host 
plant was found growing in a patch of Ranunculus abortivus 
which had this mildew upon it, and from which it had probably 
spread to the Anemone. In the Ranunculus specimen I noted 
asci from 2 to 6, with spores ranging from 
hree other species were reported in the laboratory last year, 
but as the specimens were not preserved I could not verify the 
work, and so dispose of them as nearly as possible from the 
meager descriptions in the laboratory notes at hand. 
Uncinula Americana Howe. 
n the leaves of the grape. 
A species found on the Elm, and doubtless belonging to the 
genns Uncinula, is given, but does not come under any of the 
three species assigned to this host as given by Bessey. The 
notes give number of asci 10 to 12; spores 5. C. H. Peck is 
the only one in this country who has reported finding this mil- 
dew on the Elm, and hence I judge it must not be a very common 
form. After a most searching examination of many leaves I 
was compelled to give up without finding a single perithecium. 
The species reported from the Beech is probably Phyllactinia 
suffulta Reb., as Cooke says it is commonly to be found here. 
