Observation 65483: Gymnosporangium juniperi-virginianae Schweinitz
When: 2008-05-10
No herbarium specimen

Notes: 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 08:23:39 CDT (-0400)

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
2012-11-16 23:02:16 CST (-0500)

Created: 2011-04-13 18:09:28 CDT (-0400)
Last modified: 2012-11-16 22:58:23 CST (-0500)
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