19-10-2025 18:58
Bernard CLESSE
Bonsoir à toutes et tous,Il y a un peu plus de de
19-10-2025 14:10
Camille MertensBonjour à tous.Asco stipité 1mm de texture appar
17-10-2025 18:45
Riet van Oosten
Hello, Found by Laurens van der Linde, Oct. 2025.
23-09-2025 13:31
Thomas Læssøehttps://svampe.databasen.org/observations/10534623
15-10-2025 16:39
Edvin Johannesen
These tiny (0.2-0.6 mm), white, pulvinate apotheci
03-10-2025 13:44
Riet van Oosten
Hello, Found by Laurens van der Linde on Populus
13-10-2025 19:05
Louis DENYBonjour forumSur tronc décortiqué de feuillu x,
11-10-2025 20:27
Marcel Heyligen
Found on a barked branch, 14 mm in diameter, of Ro
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