12-03-2026 15:45
Åge OterhalsDear forum,I found this small discomycete on a ver
11-03-2026 17:36
Michel Hairaud
Bonjour, Je cherche des indices pour cette réc
05-03-2026 10:07
Hulda Caroline HolteHello, I found and collected this species growing
14-03-2026 13:51
Thierry Blondelle
Hi everybody Under Quercus ilex, i hesitate to na
12-03-2026 19:44
Enrique Rubio
Hi to everybody.Can you give me any suggestions ab
08-03-2026 14:05
Thierry Blondelle
Bonjour à tous,Sur 3 récoltes supposées de H. l
11-03-2026 16:48
Bruno Coué
Bonjour, je serais heureux d'avoir votre avis sur
Dematioscypha cf. olivacea
Åge Oterhals,
12-03-2026 15:45
I found this small discomycete on a very rotten small decorticated, deciduous branch on the ground in mixed forest with Betula, Sorbus and Ilex outside Bergen at the Norwegian west coast. I believe it is Dematioscypha olivacea, and hope someone can confirm this based on the enclosed description and photos.
Disc 0.3 mm diam., grey-brown, surrounded by dark hyphomycete. Microscopy based on water mount of fresh material found in September 2025: Hairs hyaline, thin-walled, cylindric, straight, blunt, 3-septate, 63-83 x 2,3-3,0 µm. Minor amount of light-colored exudate may be observed on the upper part of some of the hairs, however, hard to confirm with certainty. Based on the macro-photo, the hairs look glued together into larger units. Asci 37-44 x 4,1-5,4 µm, cylindric, without croziers based on my interpretation. Sp. 6,6-7,7 x 2,1-2,6 µm; Q=2,7-3,3.
None of the Dematioschypha species has been found in Norway so far. The lack of larger amounts of exudate makes it difficult to follow the key in Raitviir's monograph from 2004.
Best regards,
Åge
Hans-Otto Baral,
12-03-2026 18:02
Re : Dematioscypha cf. olivacea
Was this collected in early spring? My idea is Psilocistella quercina which I know from autumn and with croziers. The same for P. variepilosa.
Åge Oterhals,
12-03-2026 19:04
Re : Dematioscypha cf. olivacea
It was collected September 16.
Åge
Åge
Åge Oterhals,
13-03-2026 10:46
Re : Dematioscypha cf. olivacea
Dear Zotto,
Thanks for your identification suggestions.
However, I find neither of them to fit my collection.
Psilocistella quercina should have shorter and aseptate hairs and larger ascospores; 20-43 µm and 7-12 x 2-3 µm, respectively.
Psilocistella variepilosa ? Resinoscypha variepilosa (R. Galán & Raitv.) T. Kosonen, Huhtinen & K. Hansen, Persoonia 46: 58 (2020) - should have longer (multiseptate) hairs up to 100 µm, and shorter asci 26-33 x 4-6 µm. The drawing of the apothecia given in FoF number 14073 does also not fit to my picture of the apothecia.
Based on my interpretation, the coexistence of dark hyphomycete surrounding the apothecia points in direction of Dematioscypha. Could you explain why you rule out any of the species in this genus?
Kind regards,
Åge
Thanks for your identification suggestions.
However, I find neither of them to fit my collection.
Psilocistella quercina should have shorter and aseptate hairs and larger ascospores; 20-43 µm and 7-12 x 2-3 µm, respectively.
Psilocistella variepilosa ? Resinoscypha variepilosa (R. Galán & Raitv.) T. Kosonen, Huhtinen & K. Hansen, Persoonia 46: 58 (2020) - should have longer (multiseptate) hairs up to 100 µm, and shorter asci 26-33 x 4-6 µm. The drawing of the apothecia given in FoF number 14073 does also not fit to my picture of the apothecia.
Based on my interpretation, the coexistence of dark hyphomycete surrounding the apothecia points in direction of Dematioscypha. Could you explain why you rule out any of the species in this genus?
Kind regards,
Åge
Hans-Otto Baral,
13-03-2026 11:11
Re : Dematioscypha cf. olivacea
You may be right, although I see no difference between hairs up to 83 µm and 3-septate, and up to 100 µm and 2-4-septate in Huhtinen. Kosonen's drawing shows asci up to 40 µm.
P. quercina also has septate hairs, see Quijada or my drawing.
But if your asci are really simple-septate (I do not see it clearly) it could be olivacea. The excipulum of olivacea (name!) is light to dark brown and the hairs often bear yellow exudate. A small fragment of brown tissue is seen on your pics. So I think I agree with olivacea as most probable option. You did not study the anamorph?
Åge Oterhals,
16-03-2026 12:51
Re : Dematioscypha cf. olivacea
Dear Zotto,
To answer your requests, I have studied a new ascocarp from the dried collection. Microscopy was based on water mount and shows the dark brown textura prismatica ectal exipulum, and hairs covered with yellow exudate. Treatment with Melzer gave no color reaction (MLZ-). I have also added a picture of the companion Haplographium anamorph. Asci septation has been studied after Congored/SDS treatment. I hope the enclosed photos confirm the simple-septate asci and give you the needed info to conclude.
Regards,
Åge
To answer your requests, I have studied a new ascocarp from the dried collection. Microscopy was based on water mount and shows the dark brown textura prismatica ectal exipulum, and hairs covered with yellow exudate. Treatment with Melzer gave no color reaction (MLZ-). I have also added a picture of the companion Haplographium anamorph. Asci septation has been studied after Congored/SDS treatment. I hope the enclosed photos confirm the simple-septate asci and give you the needed info to conclude.
Regards,
Åge
Hans-Otto Baral,
16-03-2026 15:21
Re : Dematioscypha cf. olivacea
Well done, this leaves no doubt at all! The anamorph looks very typical too.