16-02-2026 18:34
Thierry Blondelle
Bonjour,La micro de cet anamorphe de Hercospora su
08-12-2025 17:37
Lothar Krieglsteiner
20.6.25, on branch of Abies infected and thickened
16-02-2026 21:25
Andreas Millinger
Good evening,failed to find an idea for this fungu
16-02-2026 17:14
Joanne TaylorLast week we published the following paper where w
16-02-2026 16:53
Isabelle CharissouBonjour, quelqu'un pourrait-il me transmettre un
16-02-2026 11:53
Joeri Belisbetween leaf litter on twig in young salix growth.
14-02-2026 22:45
Tomaz Vucko
Hy!I would ask for some help determing this specie
13-02-2026 03:30
Tomaz Vucko
Hello! I found these immersed perithecia on a stic
Hymenoscyphus?
Josep Torres,
23-12-2025 08:27
Hello.Small, yellowish ascomata, with very short and rudimentary stalks, greenish in mature specimens, sprouting from the surface of decaying leaves of Quercus rotundifolia.
Only 0.2 to 0.4 mm in diameter.
Basal hyphae elongated, arranged parallel to each other, and pigmented.
Hyphae of the excipulum globose-angularis in texture.
Octosporous asci, with an amyloid reaction in their apical apparatus, and although difficult to observe in some of these asci, I thought I saw croziers. Fusiform ascospores with pointed ends, two or three large lipid droplets and several smaller ones scattered throughout, measuring in water:
(14.3) 16 - 19.3 (22) × (2.8) 3.1 - 4.3 (4.5) µm
Q = (4.2) 4.3 - 5.5 (5.7) ; N = 40
Me = 17.8 × 3.6 µm ; Qe = 4.9
Based on these characteristics, I think it could be a species of the Hymenoscyphus/Phaeohelotium complex, but I have no other suggestion that convinces me.
Any opinions you may have would be welcome.
Thank you in advance.
Best regards.
Hans-Otto Baral,
23-12-2025 10:57
Re : Hymenoscyphus?
You don't have living paraphyses? That would be helpful. Surely no Hymenoscyphus, the apical ring is more of the Calycina type. The brown excipulum is remarkable. There are no hairs?
Josep Torres,
23-12-2025 14:22
Re : Hymenoscyphus?
Thanks, Zotto.
I couldn't observe any structures in the prepared samples that could correspond to hairs. The closest thing were the terminal hyphae visible above the image of the excipulum, which might correspond to marginal hyphae. There were no live paraphyses either. The apothecia were past their prime, and there were only asci and a collapse of spores. Since I have quite a bit of material from this sample, if we can't reach any conclusions, I'll send it for sequencing in my next shipment, which would be next year.
Best regards.
I couldn't observe any structures in the prepared samples that could correspond to hairs. The closest thing were the terminal hyphae visible above the image of the excipulum, which might correspond to marginal hyphae. There were no live paraphyses either. The apothecia were past their prime, and there were only asci and a collapse of spores. Since I have quite a bit of material from this sample, if we can't reach any conclusions, I'll send it for sequencing in my next shipment, which would be next year.
Best regards.
Hans-Otto Baral,
23-12-2025 14:57
Re : Hymenoscyphus?
That would be interesting to obtain DNA. It looks a bit like a Hyphodiscus. But such big spores are unknown there.