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22-02-2020 16:41

Robin Isaksson Robin Isaksson

I wonder if this one is Hysterobrevium constrictum

05-02-2015 11:21

Zoltan Lukacs Zoltan Lukacs

Hi all, has someone a PDF of Mycographia, seu Icon

21-02-2020 20:43

Thorben Hülsewig

Hi there,I found this fungus on a branch (probably

22-02-2020 07:20

Mirek Gryc

Hi.It is a popular species but I have not been abl

21-02-2020 20:33

Rubén Martínez-Gil Rubén Martínez-Gil

Hola a todos. Subo unas fotos de un Ascobolus que

22-02-2020 08:22

Vasileios Kaounas Vasileios Kaounas

First time i see so little Geoglossum, 1 cm. Beca

21-02-2020 14:47

Savic Dragisa

Hi to all, I need help identifying this lichenicol

14-02-2020 15:27

Savic Dragisa

HiThey're not fungi (but who knows, maybe they are

21-02-2020 11:48

Michel Hairaud Michel Hairaud

Bonjour / Hi to everyone Le 1er numéro 2020 d'As

30-03-2013 21:25

François Valade François Valade

HelloA small yellow Bryoscyphus sp? on moss, Pleur

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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
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Hans-Otto Baral, 13-02-2020 10:47
Hans-Otto Baral
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.

Kosonen Timo, 13-02-2020 10:56
Kosonen Timo
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.

Hans-Otto Baral, 13-02-2020 11:24
Hans-Otto Baral
Re : Disques oranges
Interesting! I only know a bluegreen reaction of the orange lipids (carotenoids) in Lugol (or MLZ).

See HB 9256

Louis DENY, 13-02-2020 18:39
Re : Disques oranges
Thanks to both of you!  I was misled by the lack of subiculum.