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24-05-2022 15:01

Michel Hairaud Michel Hairaud

Dear all, organizes at Sampeyre (I

21-05-2022 17:43

Derek Schafer

Kerry Robinson found this Discomycete on Fraxinus

17-05-2022 15:28

Derek Schafer

Kerry Robinson found this stalkless brown discomyc

23-05-2022 15:32

Riet van Oosten Riet van Oosten

Hello, Found 22-05-2022 on fresh leaves of Typha

22-05-2022 12:57

Andrés Valverde Valera Andrés Valverde Valera

Bonjour,Je vous envoie des images de cet ascomycè

22-05-2022 11:39

Castillo Joseba Castillo Joseba

me mandan el material seco de Galicia,  recolecta

21-05-2022 12:35

Enrique Rubio Enrique Rubio

Dear friendsDo any of you have this article?Monogr

19-05-2022 22:05

Marcus Yeo

Earlier today I found a minute discomycete growing

20-05-2022 17:43

Andgelo Mombert Andgelo Mombert

Bonsoir, Sur branche morte attenante d'Ulmus mino

18-05-2022 09:10

Mirek Gryc

Hello everyoneA few days ago I found a small ascom

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?Rhytidhysteron on Olearia
Zuidland Peter, 19-01-2022 02:24
Hello all,
I have found this erumpant only on Olearia bush branches over the past few years and I would love some help to get to know what it might be. Might it be Rhytidhysteron?
Spores are hyaline, have up 1-3 septa with sizes 22-32.7 x 9.3-11.7um
Paraphyces: filiform, branching with undulating ends.
Asci: Lugol's -ve, Cr -ve. 

Victoria, Australia
Thanks Pete
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Hans-Otto Baral, 19-01-2022 07:46
Hans-Otto Baral
Re : ?Rhytidhysteron on Olearia
Rhytidhysteron has always brown spores. The apos lookk hairy, do they?

Would be good to get an idea of the excipulum (best in section) and the marginal hairs if there are some. Any KOH-extruding pigment?

The iodine reaction could be negative but I cannot see it for sure. Seems the apical ring does not expand on killing, but also this is not sure. Do you have immature dead asci on a photo?
Zuidland Peter, 22-01-2022 05:43
Re : ?Rhytidhysteron on Olearia
Many thanks for taking the time Hans-Otto,
It had been ID'ed as this genus and maybe Velutarina 1-2 years ago by Bjorn Wergen but only immature spores. I have been through your database and cannot find anything similar.
In the previous pics, other than Lugol's the mounting was in water.

KOH provides a reddish brown exudate.
I have a very limited supply of MLZ and in this case -ve.
Very poor images of excipulum, I hope you can make sense of the pics I send of what looks like some; sample was very poor to handle after rehydration.

Again many thanks for looking at this specimen.

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Zuidland Peter, 22-01-2022 05:58
Re : ?Rhytidhysteron on Olearia
The yellow downy edge consists of mostly granular material and interwoven fibres/?hairs.

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