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On Living Ivy

Posted: Sun Feb 03, 2019 11:21 am
by Chris Johnson
I brought this branch back as it was covered in tiny (100-200 µm) perithecia.

I initially set it for spores and got some which fit well with Diaporthe hederae, but little else does. I then tried a section but they were too small so I but 3 on a slide and was surprised to have 3 different results. The first matched the spores dropped. The second was a mass of conidia, and the third produced banana-shaped spores.

At a total loss - I will post each separately for clarity and to spread the images.

Re: On Living Ivy

Posted: Sun Feb 03, 2019 11:22 am
by Chris Johnson
Second:
Conidia 7.5-9.0 x 2.9-3.6 µm

Re: On Living Ivy

Posted: Sun Feb 03, 2019 11:22 am
by Chris Johnson
Third:
Spores 20.4-26.7 x 2.5-3.1 µm

Re: On Living Ivy

Posted: Sun Feb 03, 2019 10:06 pm
by Chris Yeates
Hi Chris
These pages from Grove's Stem & Leaf Fungi vol. II may cast some light on the middle (and possibly the first) one. Am I correct in thinking that what I am seeing in the third one are asci with elongate spores?

Re: On Living Ivy

Posted: Mon Feb 04, 2019 7:21 am
by Chris Johnson
Thank you Chris, that is a big help.

You are correct regarding the final two images. One in water, t'other in Lugol's.

Regards, Chris

Re: On Living Ivy

Posted: Tue Feb 26, 2019 12:33 pm
by Paul Cannon
Sorry, have come to this rather late. Nothing much further to add regarding the first two species, but I think the third could be Vialaea insculpta. This has isthmoid ascospores (looking like two bananas in a chain) and can break up at the constricted part. However, the spores do look slightly narrow, it would be worth re-examining to see whether the spores are actually like this. More info in FGBI.

Best wishes
Paul

Re: On Living Ivy

Posted: Sat Mar 02, 2019 8:46 am
by Chris Johnson
Hello Paul - bit late with this as I've been on Skye for a few days.

I looked closely at the time and didn't see anything that would suggest Vialaea insculpta, but note the similarity. Also, the ascomata were more superficial than images I've seen of Vialaea insculpta, especially Jenny's.

One to look out for and thanks for your thoughts.

Regards, Chris