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24-04-2026 03:16

Trinacrium robustum?
David Chapados David Chapados

Found while looking at something else from wood in

22-04-2026 20:17

Pseudaegerita spec.
Marian Jagers Marian Jagers

Is anyone familiar with the Hyphomycetes genus Pse

23-04-2026 06:46

Fungus sp
François Freléchoux François Freléchoux

Bonjour, Voici la description d'un minuscule asco

21-04-2026 22:14

Peziza
Margot en Geert Vullings

This cup fungus was found on April 10, 2026, on lo

22-04-2026 20:54

Pyrenopeziza on monocot.
Enrique Rubio Enrique Rubio

Hi to everybody.This Pyrenopeziza grew in moist le

22-04-2026 19:12

Poilu, violet avec KOH
Louis DENY

Bonjour forum.Trouvé à Belfort, est de la France

21-04-2026 21:00

Hymenoscyphus sp
Sylvie Le Goff

Bonjour à tousJe sollicite votre aide pour cet as

22-04-2026 01:06

Neonectria ou thelonectria ?
Richard VALERI Richard VALERI

Bonjour à tous.Je vous présente cette Nectria s.

21-04-2026 13:36

Wentiomyces-like on Salix
Gernot Friebes

Hi,I am out of ideas for this one. I collected Sal

21-04-2026 13:19

Lophodermium on Typha
Gernot Friebes

Hi,this Lophodermium on Typha has ascospores measu

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Stictis radiata sur Fallopia japonica
Bernard CLESSE, 10-01-2016 22:31
Bernard CLESSEBonsoir à tous,

Suite et bientôt fin de mes récoltes sur renouée du Japon. Ici je pense à Stictis radiata, d'abord parce que les apothécies sont nettement plus petites (max. 0,3 mm de diamètre) que chez Stictis stellata (diamètre parfois dépassant le mm) montré tout récemment sur Fallopia japonica toujours et que d'autre part, les spores sont ici larges de 2-2,5 mu.

Qu'en pensez-vous ?

Bernard
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Hans-Otto Baral, 11-01-2016 09:42
Hans-Otto Baral
Re : Stictis radiata sur Fallopia japonica
I recommend to make images in vital state though I am quite sure that the oil content in the spores is low. Also a section showing the periphyses at the inner face of the margin would be helpful, I remember Sherwood makes a difference based on their measurements. Did you notice any iodine reaction?
Bernard CLESSE, 11-01-2016 11:00
Bernard CLESSE
Re : Stictis radiata sur Fallopia japonica
Hi Zotto,

Thanks for your message !


I will try to make a cut of apothecium but I admit that I do not know what are the periphyses. Would you possibly a drawing or a microscopic picture so that I know what I have to observe? I will try to redo pictures spores alive.
Regarding the iodine reaction, I just noticed a very slight blue color and diffuses into the ascus (especially upper half) with lugol but not a color "deep blue" suitable for this species.

Bernard 

Hans-Otto Baral, 11-01-2016 11:35
Hans-Otto Baral
Re : Stictis radiata sur Fallopia japonica
If you pretreat with KOh you will get a distinct blue of the whole hymenium, without KOH the reaction is first blue the red-brown, and only at the top the hymenium is bluish.

What is meant with periphysoids (not periphyses, sorry) you can see here.

Sherwoods distinction is perhaps a bit weird, and her opinion about amyloidity may be wrong as she appears not to have understood the influence of KOH and Melzer's.

But I must admit I have no clear concept of thse two species.
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Bernard CLESSE, 11-01-2016 20:56
Bernard CLESSE
Re : Stictis radiata sur Fallopia japonica
Hi Zotto,

Thank you for your explanations !

Here are some new pictures :

a) hymenium+KOH+lugol : well blue !
b)  ascus+lugol : dextrinoid; ascus cap : 3,5 mu thick
c) spores guttulated

What do you think about that ?

Bernard
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Hans-Otto Baral, 11-01-2016 22:30
Hans-Otto Baral
Re : Stictis radiata sur Fallopia japonica
Oh look, these guttulate spores are exceptional, I don't know that from radiata or stellata. But I don't know these species well or can separate them.

A red reaction inside the ascus could be due to glycogen and would then be called dextriniod, but then it should be seen also after KOH, or in Melzer without KOH. What reacts blue after KOH (I think the ascus wall surface) must be red in IKI without KOH (hemiamyloid). See my homepage:
http://invivoveritas.de/articles/iodine-reaction-in-ascomycetes-why-is-lugols-solution-superior-to-melzers-reagent/
Fig. 2 and 5.