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29-03-2024 09:21

Michel Hairaud Michel Hairaud

Bonjour, Je recherche la description du genre Mac

26-03-2024 17:14

Juuso Äikäs

These little black ascos were growing on a dead, d

28-07-2011 18:31

Alex Akulov Alex Akulov

Dear FriendsToday I made the pdf file of Velenovsk

27-03-2024 22:53

Charles Aron Charles Aron

Hi All,Recently I came across these minute, setose

25-03-2024 13:41

B Shelbourne B Shelbourne

• Hyaloscyphaceae (no VBs), Hyaloscypha: Macro a

25-03-2024 21:27

Riet van Oosten Riet van Oosten

Hello, Found by Laurens van der Linde, March 2024

26-03-2024 14:37

DAVID MARCOS DAVID MARCOS

Spores (telles qu'elles apparaissent à l'intérie

24-03-2024 08:27

Thierry Blondelle Thierry Blondelle

HiOn Hedera helix fallen branchEcological habitat:

26-03-2024 11:06

michel bertrand

Bonjour, Malgré de nombreuses recherches, je n'a

25-03-2024 14:08

Ursula Kozik

Bonjour et bonne journée, On m'a envoyé une tro

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Yellow Discomycete
Danny Newman, 20-12-2014 07:06
Danny NewmanThis was found in a landscaped/garden area in urban San Francisco, CA. It is growing on woodchips and possibly a piece of dung, possibly belonging to a housecat. Some hyphae seem to possess yellow contents, particularly just beneath the hymenium. The asci are 8-spored, seemingly inoperculate with inamyloid tips. The paraphyses tips appear to be apically encrusted. No septa were observed in the spores.

Also at http://mushroomobserver.org/194082

Any and all help greatly appreciated.

-Danny
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Hans-Otto Baral, 20-12-2014 07:14
Hans-Otto Baral
Re : Yellow Discomycete
Hi Danny

to me the fungus looks operculate, but I am not sure. This could be clarified by a closeup of the ascus apex, especially if you find opered, emptied asci. Also a section of the ectal excipulum would be valuable (cell size?).

Did you see any free spores? What is their size?

Zotto
Danny Newman, 20-12-2014 07:25
Danny Newman
Re : Yellow Discomycete
Zotto,

Thank you for your prompt and informative reply.  We have taken the undried portion of the collection and placed it in a moisture chamber.  Hopefully with time the spores will begin to be discharged and the operculum will be more noticeable.  There were no spores observed floating in the medium, nor any open asci, leading us to believe that this is either inoperculate or still immature.

Will also post back with ectal excipular cell measurements shortly.

Many thanks,

-Danny
Danny Newman, 20-12-2014 08:34
Danny Newman
Re : Yellow Discomycete
We measured a range of ectal excipular cells, finding both small ones and large ones.  Their measurements are as follows:

26 x 33
27.5 x 45
30 x 43.75
33.75 x 50
12.5 x 19
11.5 x 15
12.5 x 17.5

Attached are images of these cells at both 400x and 1000x, as well as some septate, lanceolate hairs seen on the surface of the ectal excipulum at 400x, and finally a somewhat blurry image of the yellow-filled hyphae at 1000x.
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Hans-Otto Baral, 20-12-2014 08:42
Hans-Otto Baral
Re : Yellow Discomycete
yes, these large cells and the brownish setae point to the genus Cheilymenia. I am not an expert in that group.

Zotto
Danny Newman, 20-12-2014 09:05
Danny Newman
Re : Yellow Discomycete
Thank you, Zotto.  Indeed, a look at the rest of the requisite microcharacters for Cheilymenia make it a good match for this material.  Cheilymenia theleboloides did not appear to be a perfect fit going by Fungi of Switzerland's description, since it describes the hairs as hyaline.  Ascomycetes in Colour, however, describes them as hyaline to yellowish-brown.  All other microcharacters described from both texts are consistent with our observations.  The only remaining feature to check is the longitudinal striations in the mature spores, which we should be able to observe one the material has sat in its moisture chamber for a few days.

Thank you again for your kind assistance.

-Danny, Alan and Sava.
René Dougoud, 20-12-2014 10:42
Re : Yellow Discomycete
Cher Collègue,

L'appartenance de votre récolte au genre Cheilymenia ne fait aucun doute. Malheureusement les informations que vous donnez et les photos que vous présentez ne sont pas très utiles ou suffisamment explicites pour permettre de déterminer l'espèce.

Le premier caractère à déterminer dans ce genre et le type d'ornementation sporal, ceci dans le bleu coton lactique et au plus fort grossissement, puis leur dimension. Ensuite il faut surtout observer la présence éventuelle de poils en forme d'étoile, la forme basale des poils, notamment des poils sétiformes, puis les mesurer, leur couleur est importante, mais elle peut varier. Enfin il faut définir les textures des strates composant la chair. Après seulement il sera certainement possible de déterminer l'espèce.

Le genre Cheilymenia étant très interessant et les espèces nombreuses, mais assez difficiles à déterminer, je vous conseille la monographie de Jiri Moravec (2005) « A Wold Monograph of the genus Cheilymenia » Libri Botanici vol. 21 , 256 p. IHW-Verlag, ISBN 3-930167-62-x.

René