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 23:20:04 EEST (+0300)

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

Cherry, I think
By: Andrew Khitsun (Andrew)
2011-12-19 02:48:30 EET (+0200)

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)
2011-12-19 02:21:38 EET (+0200)
Maybe something in the Puccinia group
By: Paul Sadowski (pabloski)
2011-12-19 02:12:13 EET (+0200)

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)
2011-12-18 03:26:23 EET (+0200)

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

Created: 2011-12-18 03:22:15 EET (+0200)
Last modified: 2015-10-20 23:18:22 EEST (+0300)
Viewed: 40 times, last viewed: 2016-05-11 17:46:27 EEST (+0300)
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