Lichenicolous fungus on Myriolecis spec.

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Lichenicolous fungus on Myriolecis spec.

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Hi all,We found groups of perithecia on a Lecanora

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Nomenclature

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Lichenicolous fungus on Myriolecis spec.

Niek Schrier, 03-01-2026 13:08

Hi all,
We found groups of perithecia on a Lecanora/Myriolecis spec (probably Myriolecis dispersa) and can't find a name for it.

Host lichen was growing on basalt blocks near the waterline of a dyke. Perithecia mainly on the apothecia of the host. Conidia bigutate, ellipsoid sometimes with little deformations, measuring 7,5-8,5 x 3,0-3,5 ?m.

So far I considered the genus Unguiculariopsis, but dismissed it because of the lack of asci.
Does anyone have any suggestions? Thanks in advance.

Kind regards,
Niek and Tom Schrier

For more pics, see https://waarneming.nl/observation/382858810/

Paul Diederich, 03-01-2026 13:23

Re : Lichenicolous fungus on Myriolecis spec.

Dear Niek and Tom,

Your message is rather misleading. You believed to have an Unguiculariopsis, i.e., you saw lichenicolous apothecia. Then you mention perithecia. Finally conidia. So, did you see three different species, one apothecial, one perithecial and one pycnidial (coelomycetous)? The species shown in the photos is a coelomycete, i.e., an asexual fungus producing conidia within pycnidia. The pycnidial wall and the conidia, especially the guttulation, are typical for Didymocyrtis. You should compare with the known species of this genus, especially those not confined to a single host genus, to get an identification.

Best regards, Paul

Alain GARDIENNET, 03-01-2026 18:47

Re : Lichenicolous fungus on Myriolecis spec.

Heureux de te lire ici Paul, on peut dire que tu sais de quoi tu parles ici ... j'en profite pour te souhaiter une bonne année 2026, avec l'accomplissement de ton projet.

Mais je n'oublie pas tous les autres membres de ce forum, soyez tous en pleine forme cette année pour continuer de faire vivre l'étude des ascomycètes.
Meilleurs voeux à Ascofrance !

Niek Schrier, 03-01-2026 19:25

Re : Lichenicolous fungus on Myriolecis spec.

Thanks for the suggestion and quick response Paul,

And ofcourse best wishes for 2026 (Alain aswell)!

Sorry for the confusion. We only saw pycnidia, so my search into Unguiculariopsis was not a smart move. But due to the fruiting bodies that looked to be on top of the apothecia, this Genus came to mind.

I took a look at Didymocyrtis and used the key in Ertz et al. 2015 (https://www.researchgate.net/publication/283945855), leading to D. bryonthae. That matches in conidia and protruding pycnidia, however it is only found on Lecanora epibryon (which looks to grow similar as the infected thallus we saw, but is a different species not found in the Netherlands). Are other hosts possible for bryonthae? Or could it be D. slaptoniensis? I only found slaptoniensis on
Xanthoria and Physcia.

Kind regards,
Niek

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