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Dear Forum,On unidentified moss I found some small

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Erysiphe prunastri on algal crust on Prunus spinosa
Di Napier, 14-11-2023 14:16
Updated with id: Erysiphe prunastri.
While looking at lichens on a twig under a dissecting microscope, I noticed what looked like 100 um perithecia (some spherical, others apparently deflated into tiny black buttons) apparently growing on an algal crust on a Prunus spinosa twig. I now see they are called chasmo- or cleistothecia.

They look very similar to Erysiphe species (rather similar to E flexuosa on Aesculus? Update: similar, but not as wavy), with c. 100 um appendages about 6 um wide, with hooked tips.


There are several asci per cleistothecium, each with what looks like at least 8 ascospores. The asci are c 55 x 40 um. The spores are 15.5-17.9 x 9.9-11.3 um (5 spores measured).


Warwickshire, UK Thanks for any information.

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Georges Greiff, 01-01-2024 13:59
Re : Erysiphe prunastri on algal crust on Prunus spinosa
Hi Di,

It does not answer your question per se but I find these fungi from time to time on bryophytes. It seems that mature fruitbodies fall from vascular plants, as they are not connected to other things via mycelium. I guess the blow around like a tumbleweed and disperse spores further away if the ascomata can act as propagules themselves. The hairs may allow them to get hooked onto vectors. Not sure, just a theory based on my own observations and thoughts.

All the best,
George