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20-06-2019 11:06

Blasco Rafael Blasco Rafael

Hola, les parece que lo que mando sea Pirottaea tr

20-06-2019 08:31


Hello.Here is a tiny fungus growing on rotten bark

19-06-2019 19:07

Chris Yeates Chris Yeates

Bonsoir tous this fungus developed on incubated s

19-06-2019 18:29

Elisabeth Stöckli

Bonsoir, Sur tige morte d'Epilobium angustifolium

19-06-2019 14:49

Quijada Luis

Hi everybody,here our last paper of Triblidiaceae

19-06-2019 19:55

Andgelo Mombert

Bonsoir, Apothécies jusqu'à 1,5 mm de diamètre

19-06-2019 15:15

Blasco Rafael Blasco Rafael

Hola, esta muestra esta sobre ramas de Angelica sy

19-06-2019 19:45

Andgelo Mombert

Bonsoir, Sur tige morte d'ombellifère, peut-êtr

18-06-2019 17:12

Alessandro Fellin

Ritrovamento effettuato su tronco semisommerso e i

19-06-2019 12:19

Salvador Tello

Hola.Tengo estos peritecios que crecen en ramitas

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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.