Yellow disc on pinus - Forum ASCOFrance

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Yellow disc on pinus

Margot en Geert Vullings, 11-03-2024 19:22

Lying on a debarked pine branch in a heathland we found these sessile yellow fungi. When young they are discs that resemble an Orbilia, when they get older they become somewhat irregular lumps that are grainy and you think more of Mollisia-like.

Spores apple seed-shaped, measured in water:
(8.3) 8.7 - 10.5 (11.2) × (2.6) 2.8 - 3.5 (4.1) µm
Me = 9.7 × 3.2 µm ; Qe = 3

Asci Lugol +, croziers +
(54.2) 54.25 - 65.7 × (6.8) 6.85 - 8 µm
Me = 60 × 7.4 µm ; Qe = 8.1

Paraphyses, septate, branched and at least upper part granulated.

What genus could this be?
Thanks in advance, Margot&Geert

Hans-Otto Baral, 11-03-2024 20:35

Re : Yellow disc on pinus

I think we need the excipulum. The apos are up to 1 mm?

There is a white form of Durella suecica as I remember.

Margot en Geert Vullings, 12-03-2024 19:29

Re : Yellow disc on pinus

Thank you for the reply.

The discs are 1 to 1.5 mm in diameter.

We tried to make a section of a disc and numbered the different structures in the overview photo.
The numbered structures can be seen in the detail photos.
In the overview photo it looks like there is an algae layer under the disc, this algae layer is also next to the discs.
Hopefully it's that clear.

Hans-Otto Baral, 12-03-2024 21:22

Re : Yellow disc on pinus

Interesting! This rules out my idea. At the moment I am helpless.

Calycina ("Pezizella") pulvinata (folder Antinoa-like) might be similar but is on pine needles.

Margot en Geert Vullings, 12-03-2024 21:59

Re : Yellow disc on pinus

It will remain uncertain, thanks for your help.

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