Observation 84769: Gymnosporangium globosum Farl.
When: 2011-07-23
No herbarium specimen

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Recognized by sight
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I think leaves can be Serviceberry.
By: Andrew Khitsun (Andrew)
2015-10-20 13:20:04 PDT (-0700)

Good reference to rusts in the group can be found at:

Cherry, I think
By: Andrew Khitsun (Andrew)
2011-12-18 16:48:30 PST (-0800)

It appears to be one of the species of Prunus, although I can’t guarantee – there are many shrubs here with simple leaves like that. As far as an underside of Mayapple leaves goes, see my observation 83156

What is it growing on?
By: John Plischke (John Plischke)
2011-12-18 16:21:38 PST (-0800)
Maybe something in the Puccinia group
By: Paul Sadowski (pabloski)
2011-12-18 16:12:13 PST (-0800)

We see a very similar yellow spotting of May Apple leaves in June in the Northeast. On the underside in that instance one sees black spots quite possibly a teleomorph.

Fungal or not?
By: Andrew Khitsun (Andrew)
2011-12-17 17:26:23 PST (-0800)

I’m not 100% sure it’s fungal – could be some insect damage. But I’m leaning toward fungal.

Created: 2011-12-17 17:22:15 PST (-0800)
Last modified: 2015-10-20 13:18:22 PDT (-0700)
Viewed: 41 times, last viewed: 2017-06-10 04:09:40 PDT (-0700)
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