Graddonidiscus? - Forum ASCOFrance

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Graddonidiscus?

Stefan Jakobsson, 10-05-2020 23:27

Hello,

For once the path through the main key of Raitviir (2004) was short: two steps to Graddonidiscus and in the genus key one step to G. vandae. Then the problems start.

This fungus was growing on an old leaf of Vaccinium myrtillus(?) attached to a dropping of elk (Alces alces) in a boggy habitat, just a few minute scattered apos. Finland. Spores 4.7 - 5.6 × 1.4 - 1.9 µm; asci approx. 25 x 3-4; paraphyses lanceolate, about 45 x 5; ectal excipulum textura prismatica.

I would appreciate any help with this.

Stefan

Charles Aron, 11-05-2020 09:41

Re : Graddonidiscus?

Hi Stefan,

To me this looks like Lachnum rhytismatis with its crystal-capped hairs combined with the substrate. I remember finding quite frquent ascomata on fallen leaves of Vaccinium myrtillus.

Best wishes,

Charles.

Hans-Otto Baral, 11-05-2020 09:54

Re : Graddonidiscus?

Yes, I agree. But there exist different species. On Vaccinium Velenovsky described Lachnum microsporum, so this would be the option here. But there is not molecular study with enough sequences to clarify how many species might exist and how host-specific they are. In any case, the only good morphological character to separate these microspecies seems th be the ascus base (with or without croziers). Available data suggest, however, that on Vaccinium both cases occur....

Zotto

Stefan Jakobsson, 11-05-2020 10:07

Re : Graddonidiscus?

Yes, of course you are right. Too late to think clearly.

Thanks,

Stefan

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