Fungus on rosehip?

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SJBuckton
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Joined: Sat Nov 17, 2018 11:19 am

Fungus on rosehip?

Post by SJBuckton » Sat Nov 17, 2018 11:29 am

Hi all! I found a Rosa sp. rosehip on Sheethanger Common (Herts, 31/10/18) which looks as though it might have been attacked by some kind of fungus. The hip is blackened, slightly shrivelled, covered with little black pustules. There are also two holes, which might suggest something has been boring this hip as well (e.g. Carpomyia). Has anyone else seen hips like this? Any pointers for ID gratefully received. I still have the sample. Thanks!
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Possible entry/exit holes from a hip borer?
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Chris Yeates
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Joined: Tue May 26, 2015 7:01 pm
Location: Huddersfield, West Yorkshire

Re: Fungus on rosehip?

Post by Chris Yeates » Sat Nov 17, 2018 1:56 pm

Hello SJB and welcome to UK fungi
Yes almost certainly fungal, and my bet would be the "imperfect" fungus Seimatosporium rosarum. However, without seeing the conidia - "spores" - that bet would never actually be laid.
I see this very frequently (whenever I look) but to my shame seldom bother to check it under the microscope; so of course I don't record it. I'll keep my eyes open over the next few days and get back on this one with further details. I would be happy to look at it if you wish. The hip would first need to be thoroughly air-dried in a warm (not hot) place.
HTH
Chris
"You must know it's right, the spore is on the wind tonight"
Steely Dan - "Rose Darling"

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