Page 1 of 1

Ivy fungus

Posted: Thu Mar 16, 2023 7:30 am
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 ... wse_photos (Mnay seem to have a yellow "halo" around the spot

Mycosphaerella hedericola ... ricola.htm


Boeremia (Phoma) hedericola ... 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.

Re: Ivy fungus

Posted: Thu Mar 16, 2023 12:05 pm
by markwilson
I had forgotten photos!!

Re: Ivy fungus

Posted: Fri Feb 16, 2024 10:18 pm
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.