12-11-2025 09:25
Viktorie Halasu
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Discomycete on cuppue of Fagus
Bernard Declercq,
06-11-2021 16:35
Dear all,Collected on cupule of Fagus sylvatica last week:
Apothecia discoid, sessile on a small base, 0.4-0.6 mm diam. bright yellow.
Asci clavate, conical apex, 8-spored, 74-95x11-12 µm, strongly IKI blue, with croziers.
Ascospores fusiform, straight to slightly curved, 19-24x2.5-3 µm, 1(-3)-septate, constricted at the middle septum, OCI 0-1, smooth, hyaline.
Paraphyses with elongate refractive body, 2-3 µm diam., apex covered by bright yellow exudate.
Ectal excipulum composed of subglobose cells, which become more elongated towards the margin, cells covered by bright yellow exudate.
Your help would be appreciated.
Bernard
Viktorie Halasu,
06-11-2021 17:39
Re : Discomycete on cuppue of Fagus
Hello,
interesting, could it be related to Zotto's Calycina "aesculi"?
Viktorie
interesting, could it be related to Zotto's Calycina "aesculi"?
Viktorie
Hans-Otto Baral,
06-11-2021 18:12
Re : Discomycete on cuppue of Fagus
Hi Bernard
this yellow pigment strongly reminds me of Luteodiscus on mosses! Did you try KOH on it? Luteodiscus turns distinctly pink under the mic. or macroscopically.
Calycina aesculi is a white fungus and has VBs in the paraphyses. This one appears to lack VBs.
Zotto
Bernard Declercq,
07-11-2021 09:45
Re : Discomycete on cuppue of Fagus
Hi Viktorie and Zotto,
Thanks for your prompt answer.
Indeed, the apothecia turn reddish rose in KOH 10%. Moreover, the apothecia are reddissh brown once dry (without KOH pretreatment).
Zotto, do you have aby literature about Luteodiscus, genus I do not know?
Best regards,
Bernard
Thanks for your prompt answer.
Indeed, the apothecia turn reddish rose in KOH 10%. Moreover, the apothecia are reddissh brown once dry (without KOH pretreatment).
Zotto, do you have aby literature about Luteodiscus, genus I do not know?
Best regards,
Bernard
Hans-Otto Baral,
07-11-2021 10:12
Re : Discomycete on cuppue of Fagus
Good ascus photo! On the macro I cannot see clearly the colours, but it is very interesting that you could confirm this rfeaction!
The genus is undescribed as are the two species in it. This is highly astonishing since the fungus is frequent. I must admit I never found it myself, but the reason is that it prefers acidic rocks.
You can find numerous images in my Hyaloscyphaceae folder under Luteodiscus.
Peter Döbbeler detected the fungus in many herbarium specimens but also he is unaware of a description.
So your collection would be the first on a non-bryophyte substrate! And it is clearly a different species with larger asci and spores.
How many apos do you have and would it be possible to collect more?
Zotto