27-10-2025 15:29
Michel Hairaud
Bonjour à tous, Avec Elisabeth Stöckli nous avo
26-10-2025 13:39
Joaquin MartinHi,I found this fungus in a mixed forest of spruce
27-10-2025 00:34
Francois Guay
I found this strange species in Québec,Canada, gr
26-10-2025 21:23
Juuso ÄikäsHello, a couple weeks ago I found some pale, whit
23-10-2025 20:59
Patrice TANCHAUDBonsoir, est-ce que quelqu'un posséderait un com
24-10-2025 14:50
Riet van Oosten
Hello, Found by Laurens van der Linde, Oct. 2025
Disques oranges
Louis DENY,
13-02-2020 10:14
Sur bois très décomposé et imbu de feuillu (Betula?), petits disque oranges (diamètre 0.4/0.7 mm) en groupe dense. Poils à apex arrondi, 50µ, avec quelques granulations me semble-t-il. Asques à crochet, J+, spore biseriées, L=80µ. Paraphyses filiformes, à contenu huileux. Spores hyalines, sans gouttes, 1X septées y compris dans l'asque, 11-15 X 2.5-3 µ, legèrement incurvées. Excipulum prismatique.
Merci pour votre aide
Hans-Otto Baral,
13-02-2020 10:47
Re : Disques oranges
Cher Louis!
your micros are very useful, the macro needs more magnification. This must be Arachnopeziza cornuta (= A. trabinelloides). The fungus was repeatedly in this forum.
Zotto
Kosonen Timo,
13-02-2020 10:56
Re : Disques oranges
I agree with Zotto. Practically nonexistent subiculum would fit to A. trabinelloides. If the sample is still fresh, make a mount in water (small drop only), put it to 40X or so and then add excess MLZ on the side of the mount so that it runs under the cover glass. The resin should turn blue, but the reaction lasts only for some minutes and is not visible in dry/herbarium material. ---or if it is only resin that turns blue, I am not 100% sure. I havent seen fresh material that often.
Timo
Hans-Otto Baral,
13-02-2020 11:24
Re : Disques oranges
Interesting! I only know a bluegreen reaction of the orange lipids (carotenoids) in Lugol (or MLZ).
See HB 9256
Zotto
Louis DENY,
13-02-2020 18:39
Re : Disques oranges
Thanks to both of you! I was misled by the lack of subiculum.