21-12-2025 09:32
Josep Torres
Hello.A tiny ascomycete found embedded in wood in
21-12-2025 21:32
Pol DebaenstHello, Garden, Burgweg 19, Veurne, BelgiumOn 10/1
22-12-2025 23:38
Patrice TANCHAUDBonsoir, récolte sur un mur en pierre, apothéci
22-12-2025 00:47
Patrice TANCHAUDBonsoir, récolte à proximité du milieu dunaire
21-12-2025 21:40
Isabelle CharissouBonjour, j'aimerais connaitre les références de
20-12-2025 23:08
Patrice TANCHAUDBonsoir, récolte sur sol sablonneux dans l'arriÃ
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.