Collection location: York, Pennsylvania, USA [Click for map]
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 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.
Created: 2011-04-14 00:09:28 CEST (+0200)
Last modified: 2012-11-17 04:58:23 CET (+0100)
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