Ivy fungus

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markwilson
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Posts: 114
Joined: Mon Jun 01, 2015 1:42 pm
Location: Crowcombe West Somerset

Ivy fungus

Post by markwilson »

On the iNaturalist web site there has been a flurry of observations (involving over one person) of fungi on Ivy leaves. I was wondering if it if possible to separate the following:

Colletotrichum trichellum https://www.inaturalist.org/taxa/381773 ... wse_photos (Mnay seem to have a yellow "halo" around the spot

Mycosphaerella hedericola https://www.bioimages.org.uk/html/Mycos ... ricola.htm

and

Boeremia (Phoma) hedericola https://www.naturespot.org.uk/species/b ... hedericola

As far as I can tell these are the spot formers on Ivy, although there may be more.

If so, can you tell me what the key macro features are for separating these three species.
markwilson
Regular user
Posts: 114
Joined: Mon Jun 01, 2015 1:42 pm
Location: Crowcombe West Somerset

Re: Ivy fungus

Post by markwilson »

I had forgotten photos!!
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Fay Newbery
Regular user
Posts: 57
Joined: Fri Feb 08, 2019 12:46 pm

Re: Ivy fungus

Post by Fay Newbery »

I don't think there are any reliable macro features that will separate these leaf spots. I always reach for my microscope.
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