When: 2019-09-13

Collection location: Capital Area Greenbelt, Harrisburg, Pennsylvania, USA [Click for map]

Who: billyd

No specimen available

From Gleditsia triacanthos. Eight spores per ascus.

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It keyed out in:
By: billyd
2019-09-13 13:56:59 PDT (-0700)

The Powdery Mildews: Erysiphaceæ
George M. Reed
Transactions of the American Microscopical Society
Vol. 32, No. 4 (Oct., 1913), pp. 219-258 (44 pages)

By: Danny Newman (myxomop)
2019-09-13 13:01:24 PDT (-0700)

USDA fungus host db gives the following erysiphaleans on your host:

?Erysiphe ravenelii?:
Gleditsia triacanthos: United States – 45770,

?Microsphaera alni? – (Phyllactinia alnicola):
Gleditsia triacanthos (Powdery mildew.): Florida – 1,Georgia – 278,Missouri – 11289,Oklahoma – 2410,Range of host – 94,

?Microsphaera penicillata? – (Erysiphe penicillata):
Gleditsia triacanthos: Canada – 8376,Ohio – 60,

?Microsphaera ravenelii? – (Erysiphe ravenelii):
Gleditsia triacanthos (Powdery mildew.): Georgia – 278,Mississippi – 1289,South Carolina – 5993,United States – 94,

?Oidium sp.?:
Gleditsia triacanthos: Portugal – 7190,

how did you rule out the others?