14-05-2024 21:43
Thierry BlondelleBonjour,A côté de Hystérographium fraxini, ces
14-05-2024 09:19
Hans-Otto BaralHi, I want to announce for next Sunday 17.00 middl
14-05-2024 19:48
B Shelbourne• Hymenoscyphus: Habitat, macro, spores, paraphy
13-05-2024 12:48
Eduard OsieckAfter eight years (*) I found the same apiosporous
11-05-2024 18:08
B Shelbourne• Mollisia on tree leaves: On dead Quercus leave
12-05-2024 11:48
Michel HairaudBonjour , Voici une récolte d'une Rhytismataceae
10-05-2024 17:40
Anna KlosGood afternoon, Thursday during an inventory we f
11-05-2024 00:33
Ethan CrensonI'm not entirely sure that Encoelia-like is the ri
I hope someone can help me with this one.
Ecology: On oak cupule
Macroscopic description:
Perithecia slightly pyriform, about 0.35 mm in diameter and 0.4 mm in height, with a brown-orange colour (no colour change in KOH). Seated superficial on the cupule surface without an obvious subiculum. The ostiole is distinctly cone-shaped and slightly darker in colour than the surrounding perithecial wall.
Microscopic description:
Perithecial wall consists of round to angular, somewhat thickwalled brown cells of usually 20-30 µm of diameter. At the perithecium base I observed very thickwalled hairlike Elements > 100 µm long and about 10 µm in diameter (see photo). Asci extremely thinwalled, nearly invisibly surrounding spores, spore-bearing part about 70 x 20 µm, no iodine reactions. Spores 50-55 x 5-6 µm, yellowish, 3-septate and often bent, with many oildrops.
Thanks for any help
Stefan
You should re-name the title of your message with the word "Calonectria" in order to be attractive for the specialists oh this genus.
Alain
Thanks a lot, Alain
Alain is right, it is a Calonectria, most likely C. pyrochroa which can occur on various substrates but is often present at this season on dead acorn cupules of Quercus in the litter. The greenish refractive hairs are those of the host, I had fallen into the trap too!
Cheers,
Jacques
I already had a weak suspicion that the hairs do not belong to the fungus. Thanks a lot for the identification.
Stefan