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Enrique Rubio
Perhaps some of you can help me identify this smal
Tiny apothecia on Acer campestre
Karen Poulsen,
23-09-2024 17:24
Hi there,
I found a few very small apothecia on overgrown rotting wood, approx. 100 µm diam. Brown exterior. Asci multi-spored, approx. 20 x 7 µm. Spores somewhat triangular with 2(3?) elongated poles, 2 x 1.5 µm.
Any idea of what it could be?
Thank you!
Best regards
Karen
Hans-Otto Baral,
23-09-2024 17:38
Re : Tiny apothecia on Acer campestre
What was the colour of the apothecia. Do they have an open disc or is it a perithecium? Iodine reaction?
Karen Poulsen,
23-09-2024 17:46
Re : Tiny apothecia on Acer campestre
Brown, open disc. Haven't checked iodine reaction. Will do that...
Karen Poulsen,
23-09-2024 18:00
Re : Tiny apothecia on Acer campestre
No reaction in lugol
Hans-Otto Baral,
23-09-2024 20:45
Re : Tiny apothecia on Acer campestre
Now I have an idea: the spores look a bit triangular. Could it be Deltopyxis triangulispora?
Karen Poulsen,
23-09-2024 21:02
Re : Tiny apothecia on Acer campestre
Surely! I found your paper Deltopyxis triangulispora gen. et sp. nov.,
Article · February 2013. I'm convinced, it must be that species.
Thank you so much!
Karen
Thomas Læssøe,
24-09-2024 11:37
Re : Tiny apothecia on Acer campestre
but the spores Karen has measured are consirably smaller. It this a problem?
cheers
cheers
Karen Poulsen,
24-09-2024 12:56
Re : Tiny apothecia on Acer campestre
A new prep shows bigger spores. I have measured 15 spores, (2)2,4-2,9(3,2) x 1,7-2,5 µm
Hans-Otto Baral,
24-09-2024 18:08
Re : Tiny apothecia on Acer campestre
I also noticed this discrepancy. The protologue has:
*(2.5-)2.8-3.5(-4) × (2-)2.2-2.8(-3) µm {7}, †2.3-3
× 1.8-2.3 µm {1}, *1.8-2.3 µm wide in dorsal view
(†1.7-1.9 µm)
× 1.8-2.3 µm {1}, *1.8-2.3 µm wide in dorsal view
(†1.7-1.9 µm)
So it is in the scope. I forgot to consider the paraphyses. Can you see the septa and a capitate short-celled apex with brown exudate?
Karen Poulsen,
24-09-2024 21:52
Re : Tiny apothecia on Acer campestre
Yes, you can see septa, capitate apex, some of which with brown exudate on 3 new photos.
Karen Poulsen,
24-09-2024 22:16
Re : Tiny apothecia on Acer campestre
The apothecia were found on dead branch from an old hedgerow in an open hilly landscape.
Hans-Otto Baral,
25-09-2024 09:33
Re : Tiny apothecia on Acer campestre
Ah, very clear! So Acer would be a new substrate. Was the branch broken and lying on the ground? Usually the apothecia develop on attached xeric branches. Can you confirm Acer by wood anatomy if the branch was broken?
Karen Poulsen,
25-09-2024 11:34
Re : Tiny apothecia on Acer campestre
I'm quite sure, the branch was on the ground and that the apothecia were on the underside of the branch on/or close to perhaps Vuilleminia. Right next to them were also Flagelloscypha sp and another tiny unknown fungi - DMS-10454272 on https://svampe.databasen.org
I'm meeting with Thomas Læssøe in a few days and I'll discuss wood and funga with him. Maybe you would be interested in receiving the collection?
Hans-Otto Baral,
25-09-2024 16:41
Re : Tiny apothecia on Acer campestre
I do not need the collection I only want to be sure that the unusual substrate is correct. A strong handlens or a 5-10x macrolens is sufficient for viewing a cross-cut of the wood and identify the most common angiosperm gerena.
Karen Poulsen,
25-09-2024 20:22
Re : Tiny apothecia on Acer campestre
Back on the location I think I have solved the mystery about the branch on the ground. It had been cut off in one end and the other end was frayed. Looking at the other side, I noticed the hedge had been cut. Some of the branches were hanging, but still attached to the tree. (Two photos).
I'll get back to you about tree species after I've verified with Thomas.
Hans-Otto Baral,
25-09-2024 21:53
Re : Tiny apothecia on Acer campestre
Looks like Acer campestre indeed!
Hans-Otto Baral,
26-09-2024 11:26
Re : Tiny apothecia on Acer campestre
I now realised that there was already a collection on Acer (see my folder in Ostropomycetidae).