May, 1911.] 
Ohio Species of Uncinula. 
35 1 
The plant is sometimes known as Calostoma cinnabarinum. 
The thick rooting base is made up of a number of anastomosing, 
somewhat gelatinous, cordlike fibers. The fruiting portion of the 
plant is subglobose and has two coats. The outer coat (exoper- 
idium) is gelatinous when wet and at maturity breaks into pieces 
and falls away. The inner (endoperidium) is thin and bright red 
when fresh but soon fades. The mouth is a radiate opening, red 
on the inner margin and with the border raised. Lining the 
endoperidium is a special membrane which contains the spores. 
At maturity, this is said to contract so as to force the spore mass 
out through the rayed mouth. The spores were shed from all 
our specimens but are said to be elliptical and G-8X 10-20 microns 
in size. 
This find extends the range of this species and adds to the 
number of known Ohio Gastromycetae. 
TWO UNREPORTED OHIO SPECIES OF UNCINULA. 
Wilmer G. Stover. 
In the Ohio Naturalist for May, 1910, W. C. O’Kane* listed 
and described six Ohio species of Uncinula. Recently, in working 
over material collected at Oxford, Ohio, in 1908 and 1909, the 
writer has found two other species of that genus. Though doubt- 
less collected by others, this seems to be the first published notice 
of their occurrence in the state. Specimens have been placed in 
the State Herbarium. 
In the descriptions which follow, the writer has drawn rather 
freely from Salmon’s paper on the Erysiphaceae.f 
Uncinula parvula Cooke & Peck. Amphigenous; mycelium 
evanescent; cleistothecia usually hypophyllous, scattered, 86-122 
microns in diameter; appendages 50-160, one-half to three-fourths 
the diameter of the cleistothecium, simple, colorless, nonseptate, 
smooth, 3-4 microns wide, apex simply uncinate ; asci 5-8, broadly 
ovate; spores 4-7. On leaves of Celtis occidentalis. Oxford, O. 
October, 1908. 
Uncinula geniculata Gerard. Epiphyllous; mycelium thin, 
forming definite patches or more or less effused, sometimes evan- 
escent; cleistothecia somewhat gregarious on the patches or scat- 
tered, 90-120 microns in diameter; appendages 24-46, one and 
one-fourth to twice the diameter of the cleistothecium, 3-4 microns 
wide, some usually abruptly bent or geniculate, simple, colorless, 
*0’Kane. W. C. The Ohio powdery mildews. Ohio Naturalist 10- 
166:176. pi. 9-10. 1910. 
f Salmon, Ernest S. A monograph of the Erysiphaceae. Memoir Torr. 
Bot. Club 9:1-292. pi. 1-9. New York 1900. 
