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Karl Soler Kinnerbäck

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Hello,found on dead, dry, attached (and fallen) tw

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Asco on scales of old poplar buds, i think not G. gemmarum
Simon Gurtner, 09-04-2024 21:40
Simon GurtnerGood evening

found on 25.03.2024 in Bern, Switzerland near the river Aare on scales of old poplar buds. My first thought was Gemmina gemmarum, but the asci are clearly too long and the spores are too broad.


Fruiting bodies solitary to gregarious, whitish to light ochre in colour, reddish brown at the base of the stipe in older fruiting bodies. Apothecium 0.5 - 0.7 mm, clearly stalked. Stalk about 1.5 times as long as the diameter of the apothecia. Stalk, flank and margo of the apothecium covered with conspicuous hairs.


Asci IKI + with hooks, 8 spores, biseriate around 98 x 7.5 my.
Paraphyses cylindrical, apically not expanded and the asci not protruding, with VBs or LBs (I cannot yet interpret this correctly) which can be beautifully coloured in Brilliant Kresyl Blue.
Hairs hyaline to ochre coloured, twice septate and apically clearly capitate and granulated or warty.
Spores hyaline, oval, slightly acuminate at one end OCI = 1-2,
(7.6) 8.9 (11.2) x (4.1) 4.6 (5.0), Q= 2.04, n=27


Can anyone help me with this finding?


Greetings, Simon

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Hans-Otto Baral, 09-04-2024 22:15
Hans-Otto Baral
Re : Asco on scales of old poplar buds, i think not G. gemmarum
I think it is G. gemmarum. Did you look if 4 spores in the ascus are smaller?

Something is strange, on your 14. photo I measure the largest spores only 3.5 µm wide. Also I think the asci are around 50 µm long. But on your last pics the spores are up to 4.5 µm wide.

It is interesting to see such variation, but I cannot believe that this points to a different taxon.
Simon Gurtner, 09-04-2024 23:05
Simon Gurtner
Re : Asco on scales of old poplar buds, i think not G. gemmarum
Hallo Zotto

ich habe alle meine Messungen in Wasser gemacht und nur freie Sporen gemessen. Wenn ich die Bilder richtig durchgezählt habe, zeigt dieses Bild die Jodreaktion der Asci, also in Baralscher Lösung gemacht.

Grüsse, Simon
Simon Gurtner, 09-04-2024 23:10
Simon Gurtner
Re : Asco on scales of old poplar buds, i think not G. gemmarum
.... und vielen Dank für die schnelle Antwort :)
Hans-Otto Baral, 10-04-2024 07:15
Hans-Otto Baral
Re : Asco on scales of old poplar buds, i think not G. gemmarum
Ja genau, das meinte ich, und da sind sowohl der Ascus als die Sporen noch vital. Die Heterosporie der Asci ist wirklich ein gutes Merkmal, ich glaube das trifft für jeden Ascus zu, nur ist der Größenunterschied nicht so auffällig. Die von mir verglichenen Maße stammen auch von vitalen Sporen in Wasser, deshalb sind deine Beobachtungen schon bemerkenswert. Du kannst mir gerne ein paar der Bilder per Mail schicken, also mit mehr Auflösung, besonders das letzte, dann lege ich das in meinem Verzeichnis ab (sonst vergesse ich den Fall beim nähsten Mal). Achja, hast du ein Foto von so langen Asci (98 µm)?