62 
Journal of Mycology 
[Vol. 10 
“Gloeosporium Toxicodendri, E. & M., n. s. 
“Spots amphigenous, dirty white, small (2 mm.) with a rather broad, 
nearly black border. Acervuli scattered, not numerous, dark colored. 
Spores oblong, 1-septate, 12-15 x 5-6 m.” [corrected, 20-40 x 2^4-3, mostly 
22 x30 ]. J. B. Ellis and B. M. Everhart. Journal of Mycology, 1:116. 
September, 1885. 
By a clerical error Stylosanthes bidora (L.) B. S. P. was given as the 
host for No. 53. Please clip out from the reprint the host named below 
and paste same over the incorrect name on the label in the Ohio Fungi 
ex sic c at i: 
Strophostyles helvola (L.) Britt. 
MINOR MYCOLOGICAL NOTES. III. 
W. A. KELLERMAN. 
Podosphaera tridactyla. — Having occasion to refer to 
herbarium specimens of Podosphaera recently, I was surprised to 
find that most of them named P. kunzei, P. tridactyla or P. 
oxyacanthae var. tridactyla, were not the form authoritatively 
named as last given. This is a repetition of the decision pub¬ 
lished by Salmon in his Monograph of the Erysiphaceae, in Mem. 
Torr. Bot. Club, 11:37 4 Oct. 1900, where he states as follows: 
“Without exception all the plants labelled P kunzei (the name 
under which Leveille united ‘P. tridactyla’ and ‘P. myrtillina’) 
that I have seen, belong to P. oxyacanthae.” 
Of the American specimens examined — more than 100, 
widely distributed over the United States — labelled P. kunzei, P. 
oxyacanthae, P. oxyacanthae var. tridactyla, and Microsphaera 
fulvo-fulcra, all prove to be typical P. oxyacanthae (DC.) De- 
Bary. 
Mrs. Flora W. Patterson kindly allowed me to examine a 
specimen from Seattle, Wash., on Spiraea douglasii, originally 
labelled Sphaerotheca humili, which Salmon pronounced P. oxya¬ 
canthae var. tridactyla. The same mycologist of the United States 
Department of Agriculture also gave me the opportunity to exam¬ 
ine 46 other specimens variously labeled as mentioned in the first 
part of this note. The specimens similarly labeled, in the Mis¬ 
souri Botanical Garden Herbarium were likewise generously 
placed at my service for critical examination. I have to thank in 
addition the Carnegie Museum and other parties for similar kind¬ 
ness with reference to their specimens. 
All American specimens proved to be Podosphaera oxya¬ 
canthae — the only P. tridactyla found being the Seattle speci¬ 
men alluded to above. Several European specimens labeled P. 
tridactyla and P. oxyacanthae were examined and generally found 
true to name. When labeled P. kunzei they were readily referred 
to P. oxyacanthae, or to P. tridactyla. It is thought remarkable, 
if not quite inexplicable, that P. tridactyla should be found on the 
single host and in the single locality in this country. 
