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, cord like 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-SX 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 haA^e 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. pL 9-10. 1910. 



t Salmon, Erxest S. A monograph of the Erysiphaceae. Memoir Torr. 

 Bot. Club 9:1-292. pi. 1-9. New York. 1900. 



