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18-09-2025 08:35

Edmond POINTE Edmond POINTE

Bonjour amis mycologues,Trouvé sur moquette de ch

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Philippe PELLICIER

Sur branche morte de Mélèze. Les ascospores sphÃ

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Philippe PELLICIER

Apothécies enterrées, fermées au début puis s'

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Heather Merrylees

Hi there!I am hoping for any advice on the identif

11-09-2025 16:57

Jason Karakehian Jason Karakehian

Our revision of Marthamycetales (Leotiomycetes) is

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Minute hyaline ascomycete on beech leaves
Gustaf Fredell, 22-10-2024 00:46
Gustaf FredellHello,
Recently I found these very small ascomycetes (< 1mm) on decaying beech leaves, seemingly emerging from leafspots and they also had a little "hat" of black tissue presumably punched out of the leaf when the hymenium emerged. Some but not all flouresced heavily green under UV. Ascospores hyaline, gluttulated, fusiform, non-septate, (13)14.49(18.12) x (1.92)2.33(2.79) uM, Qe=6.24, n=20.

Given that they seem to be emerging from a leafspot I have checked the telemorphic forms of common beech leafspots, but I have had no luck. I was hoping that someone may be able to shed light on this tiny fungi! 

Kind Regards,
Gustaf Fredell
  • message #80469
  • message #80469
  • message #80469
  • message #80469
Lothar Krieglsteiner, 22-10-2024 03:09
Lothar Krieglsteiner
Re : Minute hyaline ascomycete on beech leaves
Hello Gustaf,
macroscopical appearance and spores could fit with Calycellina fagina. It would be good to have some more details: excipulum, ascus-porus reaction with IKI, paraphyses, etc., anyway.
Yours, Lothar
Gustaf Fredell, 22-10-2024 09:27
Gustaf Fredell
Re : Minute hyaline ascomycete on beech leaves
Hi Lothar,
Thank you very much for your reply. After checking it seems to be a good fit. Unfortunately I don't have chemicals, im still quite new to asco ID. Im starting to realise how important to excipulum is, as I had never really bothered to take photos of it until a couple months ago, so im still not in the habit of looking specifically for it! Here is a photo I took of the shield however, of this is at all useful.
Kind Regards
Gustaf Fredell
  • message #80471
Hans-Otto Baral, 22-10-2024 10:41
Hans-Otto Baral
Re : Minute hyaline ascomycete on beech leaves
Yes, it is clearly the shield (scutum) of C. fagina. It should be around 100 µm diam. and the apothecia around 200 µm.
Gustaf Fredell, 23-10-2024 13:40
Gustaf Fredell
Re : Minute hyaline ascomycete on beech leaves
Thank you for the help!