These are the aecia of the rust fungus Cumminsiella mirabilissima on the berries of its host - Mahonia aquifolium. This is the stage of the rust that produces aeciospores.
Dave
Edit: Name of rust changed after spore examination.
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Infected berry. 1x cropped
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Closer view.
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Young aecia - 20x objective cropped
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Cross-eyed stereo
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Aeciospores of Cumminsiella mirabilissima
Cumminsiella mirabilissima Aecia
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Cumminsiella mirabilissima Aecia
Last edited by micro_pix on Fri Jun 11, 2021 8:15 am, edited 1 time in total.
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Re: Puccinia graminis Aecia
These are much nicer looking than the ones that infected some of my pears. I like the cupped form!