Observation 65483: Gymnosporangium juniperi-virginianae Schweinitz

When: 2008-05-10

Collection location: York, Pennsylvania, USA [Click for map]

Who: John Dawson (podospora)

No specimen available

The first photo is a photomicrograph of the two-celled teliospores of cedar apple rust. The second is a composite showing the gall on juniper, the telial horns, the teliospores, and the aecia on the underside of an apple leaf.



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The aecia appear to be of Gymnosporangium yamadae
By: John Dawson (podospora)
2013-10-16 20:23:39 CST (+0800)

The latest issue (Fall 2013) of Fungi magazine has an article by Alan Biggs on rusts of the genus Gymnosporangium. Although my composite photo features images taken in my next-door neighbor’s front and back yards, it seems that the gall, telial horns and teliospores on his juniper tree are those of G. juniperi-virginianae, while the aecia on the underside of the leaves on his apple tree are of G. yamadae, an invasive species from Asia only recently discovered in the U.S. I will look next spring to see if his juniper is also infected by that rust.

Cool spores
By: Byrain
2012-11-17 12:02:16 CST (+0800)

Created: 2011-04-14 06:09:28 CST (+0800)
Last modified: 2012-11-17 11:58:23 CST (+0800)
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