Perithecia in slits on Oak

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JennyS
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Posts: 117
Joined: Wed May 13, 2015 6:08 pm

Perithecia in slits on Oak

Post by JennyS » Wed Mar 13, 2019 7:31 pm

Its been a while since I've looked at microfungi and I'm already struggling!
Multiple perithecia in slits in a fallen oak branch, spores hyaline, 3-septate, 17-22 x 5-6 µm. Paraphyses present, asci without croziers.

Help appreciated - but am I missing something obvious in Ellis & Ellis?
z Q1 190312 016 Quercus.jpg
z Q1 190312 018 Quercus.jpg
z Q1 190312-5 17-20x5-6.jpg
z Q1 190312-7 17-20x5-6.jpg
Jenny Seawright

Paul Cannon
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Re: Perithecia in slits on Oak

Post by Paul Cannon » Sun Mar 17, 2019 5:57 pm

I would look at Chaetosphaeria ovoidea (in Ellis & Ellis as Zignoëlla ovoidea), but more information on characters such as the ascus tip would be helpful. It's a common plurivorous species, so you wouldn't frighten the horses by giving it that name....

Best wishes
Paul

JennyS
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Re: Perithecia in slits on Oak

Post by JennyS » Sun Mar 17, 2019 10:49 pm

Thank you for the reply Paul - I did look at Chaetosphaeria ovoidea but had discounted it as the perithecia appeared to be erumpent rather than superficial.

Below is an image of the ascus tip that I hope might help - I tried with both Lugols and K+Lugols to see if there was a blue reaction but appeared negative
z Q1 190317-9-2 ( K+Lugols).jpg
Jenny Seawright

Paul Cannon
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Re: Perithecia in slits on Oak

Post by Paul Cannon » Tue Mar 19, 2019 9:52 am

I still think this is a likely - ID - it may be colonising an existing fissure in the bark rather than causing it.

Best wishes
Paul

JennyS
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Posts: 117
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Re: Perithecia in slits on Oak

Post by JennyS » Tue Mar 19, 2019 10:05 pm

Thanks Paul
Jenny Seawright

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