Disques oranges - Forum ASCOFrance

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Disques oranges

Louis DENY, 13-02-2020 10:14

Bonjoiur, ceci est ma première demande d'aide. Merci pour votre indulgence.

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.

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