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16-06-2019 11:54


Hello.Here is a Hymenoscyphus species growing on b

16-06-2019 12:07

Riet van Oosten Riet van Oosten

Hello, Found by Theo Westra, 13-06-2019 (The Neth

14-06-2019 15:32

Malcolm  Greaves Malcolm Greaves

A small group of Perithecia on rotten (salix?) woo

14-06-2019 09:40

Per Marstad Per Marstad

I have found this in Norway, on hardwood, laying o

14-06-2019 06:40

Django Grootmyers

What is this parasite of Cantharellus minor? Found

11-06-2019 01:49

Valencia Lopez Francisco Javier

Hola amigos...Adjunto fotos de unas supuestas Para

11-06-2019 00:32

Elisabeth Stöckli

Bonsoir, Sur feuilles de ronce (Rubus/roncier à

11-06-2019 16:20

Garcia Susana

Hola, He recolectado este asco sobre estiercol, c

12-06-2019 22:42

Ethan Crenson

Hello all, A friend noticed these tiny fruiting b

11-06-2019 00:08

Ethan Crenson

Hello all, I found a few of these tiny black cush

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Small Hymenoscyphus on Robinia petioles
Manak Roman, 08-01-2019 19:43
Hi all,

in December, I found small Hymenoscyphus on old petioles of Robinia pseudoacacia. Frutibodies had a diameter around 1 mm (the biggest one 1,5 mm) and similar height. The young fruitbodies was yellow, elderly was lighter.

Asci without croziers, IKI+, Mlz+ (without KOH pretreatment), 90-112×7,7-10,7 µm, spores 16,6-24,5×3,7-5,6 µm (measured in fresh state).

Do not you have any tip?


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Hans-Otto Baral, 08-01-2019 20:23
Hans-Otto Baral
Re : Small Hymenoscyphus on Robinia petioles
My guess is H. scutula. A blackish stroma seems to be absent, and spore size looks good. very short setulae seem to be present.

Living paraphyses you did not study?
Bernard Declercq, 09-01-2019 15:18
Bernard Declercq
Re : Small Hymenoscyphus on Robinia petioles
Hi Roman and Zotto,

Based on ascus length a typical H. vitellinus, which I collected a.o. on petioles of Fraxinus. But I do not know if molecular studies  accepted H. vitellinus and H. scutula being separate species.

Hans-Otto Baral, 09-01-2019 16:37
Hans-Otto Baral
Re : Small Hymenoscyphus on Robinia petioles
Hi Bernard!
Molecular studies on Hymenosc. scutula are sparse!

Chinese H. scutula (KC416308, KC416309) is Cyathicula coronata (!)

Japanese H. scutula (AB926114) might be good, or more probably 

New York (small town Cuba) H. scutula (KC481695), which has 10 nt distance from the next:

Swiss sample (ZT 4292) not in GenBank which is very close to a Netherlands sample in CBS 101.66

And that's it!

Manak Roman, 09-01-2019 19:24
Re : Small Hymenoscyphus on Robinia petioles
Hi Zotto and Bernard,

thank you. My first opinion was Hymenoscyphus scutula too. But in the Beranrd's key is written that apos should have reddening. I did not notice that.

Zotto, I'm sorry, but I forgot to thoroughly explore paraphyses.

Hans-Otto Baral, 09-01-2019 20:29
Hans-Otto Baral
Re : Small Hymenoscyphus on Robinia petioles
Reddening is a consequence of the presence of striking VB-guttules in the paraphyses, and in most typical Hymenoscyphus species they occur. I think your seond photo shows a reddish hymenium.
Manak Roman, 11-01-2019 20:36
Re : Small Hymenoscyphus on Robinia petioles

thank you for your explanation. There is a hint of redness on a larger picture.