Observation 84769: Gymnosporangium globosum Farl.

When: 2011-07-23

Collection location: Walking Iron Park, Dane Co., Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

No specimen available



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Recognized by sight
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I think leaves can be Serviceberry.
By: Andrew Khitsun (Andrew)
2015-10-20 15:20:04 CDT (-0500)

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

Cherry, I think
By: Andrew Khitsun (Andrew)
2011-12-18 18:48:30 CST (-0600)

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 18:21:38 CST (-0600)
Maybe something in the Puccinia group
By: Paul Sadowski (pabloski)
2011-12-18 18:12:13 CST (-0600)

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 19:26:23 CST (-0600)

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

Created: 2011-12-17 19:22:15 CST (-0600)
Last modified: 2015-10-20 15:18:22 CDT (-0500)
Viewed: 41 times, last viewed: 2017-06-10 06:09:40 CDT (-0500)
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