27-04-2026 20:52
Lothar Krieglsteiner
Found on hanging tiwg of Olea europaea in dried-ou
27-04-2026 18:48
Tony MoverleyCollected 23rd April 2026, Norfolk, EnglandSwarms
27-04-2026 17:41
Lothar Krieglsteiner
.. Algarve, same leaf than the last post. The con
27-04-2026 18:05
Lothar Krieglsteiner
... still attached at standing tree. The green con
27-04-2026 17:16
Lothar Krieglsteiner
.. Algarve, moist lying.The conidiomata look like
27-04-2026 12:54
Steve ClementsBonjour. Ce petit champignon blanc résupiné et
27-04-2026 09:59
Pauline. PennaBonjour Can anyone advise me on these pycnidia fo
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Enrique Rubio
Hi to everybody.This Pyrenopeziza grew in moist le
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?
Thanks
Roman
Hans-Otto Baral,
08-01-2019 20:23
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?
Living paraphyses you did not study?
Bernard Declercq,
09-01-2019 15:18
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.
Bernard
Hans-Otto Baral,
09-01-2019 16:37
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!
Zotto
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!
Zotto
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.
Roman
Hans-Otto Baral,
09-01-2019 20:29
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
Zotto,
thank you for your explanation. There is a hint of redness on a larger picture.
Roman