NOTES ON THE ERYSIPHACEAE 85 
it has attacked Crawfords, and upon Seneca lake I have seen a 
peach known as the Denton almost ruined by it. The fungus gen- 
erally appears when the peach is very small, as irregular mouldy or 
frost-like patches upon the surface. Later on, these patches be- 
come brown and hard, and the peach cracks, The same mildew 
also attacks’ the leaves, covering them with a whitish mould-like 
substance and causing them to become hard and curled.” 
Waite (Ann. Rep. Dept. Agric. for 1888: 353. 1889) also ob- 
serves that P. oxyacanthae causes considerable harm to the peach. 
Other writers, however, state that the peach mildew is Sphaerotheca 
pannosa (see p. 92). 
P. OXYACANTHAE TRIDACTYLA (Wallr.) Salm. (Monograph, p. 36) 
flosts, add: Prunus Grayana, Pyrus Aucuparia (18). 
Distrib. add : Tasmania (62). : 
Professor Shotaro Hori has sent me the present plant on the 
leaves of Prunus Grayana from Mt. Isukuba, Japan (coll. is 
Nishida, Nov. 1900). This is the second record of the var. 
tridactyla from Japan, the fungus in the first case having occurred 
on Prunus communis. The present form on P. Grayana, al- 
though clearly referable to the var. tridactyla, slightly approaches 
the type in the tendency shown by the appendages of many of 
the perithecia to diverge somewhat instead of being erect. The 
apex of the appendages frequently shows the elongated primary 
branches characteristic of the var. ¢ridactyla (see monograph, 
PP. 110, 111), 
: Bubak has recorded (g) the occurrence in Bohemia of ‘“ ?. 
iridactyla De By.” on the leaves of Potentilla reptans. Dr. Bubak 
informed me that the specimens have unfortunately been lost. It 
Most unlikely that the Potentil/a was here really serving as a 
hos Eplant ; probably, if the fungus was correctly determined, the 
Perithecia of the Podosphaera were merely accidentally adhering to 
© Potentilla leaves (see monograph, p. 23, for similar cases). 
F. BIUNCINATA Cooke & Peck. (Monograph, p. 39) 
ee . add - * Rehm, Ascomycet. 1100; Shear, New York 
a hi 139 (in herb. Jaczewski). 
