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21-05-2025 17:28

éric ROMERO éric ROMERO

Bonjour Tous, Avec la bonne fiche cette fois (mer

22-05-2025 08:55

Josep Torres Josep Torres

Hello.A Pezizal sprouting scattered in small group

22-05-2025 17:17

Per Marstad Per Marstad

I have found this on Alnus glutinosa. Growing unde

19-05-2025 09:42

Josep Torres Josep Torres

Hello.An ascomycete photographed on April 20, spro

21-05-2025 08:31

Josep Torres Josep Torres

Reddish-brown, grain-like ascomata, measuring 0.7â

20-05-2025 09:37

Josep Torres Josep Torres

Hello, an anamorph photographed last April 20th, s

20-05-2025 22:15

Francois Guay Francois Guay

I found this ascomycete at the base of a dead fern

20-05-2025 21:36

Francois Guay Francois Guay

I found this Mollisia sp. on a submerged herbaceou

20-05-2025 10:31

Castillo Joseba Castillo Joseba

me mandan elmaterial seco de Galicia, (España) 

16-05-2025 05:47

Francois Guay Francois Guay

I found this super tiny hyaline asco on fir needle

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Gelatinous hyaline discs (Exidia ?)
Stephen Martin, 27-11-2017 17:09
Stephen MartinDear friends, I have come across what I believed to be an ascocarp but after microscopical investigations, I don't what it is composed of!!!


The bodies were jelly-like and very difficult to slice, hyaline or slightly pulverous above, astipitate, cushion-like bodies sitting on the surface of a decaying twig, sometimes coalescing to form colonies. Some individuals had a pale ochraceous granule at the centre which under the microscope seems to be abiotic and disintegrate into amorphous particles 

When finally I sliced a section, I could see a meshwork of numerous 'hyphae' without any special reproductive organs. No spores could be detected.

Is it an Exidia?


Sliced section shows a central amorphous body suspended in a loose gelatinous tissue composed of loose hyphae in a meshwork network (very thin - 1um ) and an outer layer made up of a different  denser tissue, but without any special organs (eg asci) 

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Lothar Krieglsteiner, 27-11-2017 17:13
Lothar Krieglsteiner
Re : Gelatinous hyaline discs (Exidia ?)

Hello Stephen,


although the micros are very small, I am quite sure that your fungus is not an ascomycete but a Heterobasidiomycete.


Best regards, Lothar

Chris Yeates, 27-11-2017 17:30
Chris Yeates
Re : Gelatinous hyaline discs (Exidia ?)
I'm sure Lothar is correct. I would suggest Exidia nucleata.  Microscopy would confirm it but there appear to be white Calcium oxalate inclusions.
amitiés
Chris
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Stephen Martin, 27-11-2017 18:17
Stephen Martin
Re : Gelatinous hyaline discs (Exidia ?)


Dear friends,

I agree perfectly - I just examined better the slide and although I could not see the spectacular basidia of this genus,  there are 'basidioles' which are matching with those of Exidia sp.  The central calcium oxalate deposit is typical of Exidia nucleata:

http://cemachampi.blogs.sudouest.fr/archive/2014/02/20/etude-exidia-nucleata-une-exidie-a-concretions-d-oxalate-de-1017337.html

I washed the specimen in KOH and maybe I washed away the spores from the surface. I'll prepare a slide from a raw specimen. COOL!
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Stephen Martin, 27-11-2017 18:50
Stephen Martin
Re : Gelatinous hyaline discs (Exidia ?)
Basidia found , Exidia 100% confirmed, probably E. nucleata because of the Calcium oxalate  amorphous granule at the centre of the basidiocarp.

Spores (or conidia?) also observed.
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