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Yellow Hymenoscyphus?
Yatsiuk Iryna, 30-09-2016 17:46
Yatsiuk IrynaHello dear all,

Recently I've found this yellow one on petioles of Fraxinus. I had many other collections this time and didn't explored it in fresh condition:( Nevertheless, maybe you will have ideas about it?
I think it is Hymenoscyphus but not sure. Maybe Phaeohelotium?
Spores in average (30 spores) 12,9 x 5,5 um, Q=2,35
Asci dead, approx. 90 x 12 um, apex of Hymenoscyphus-type (??), blueing in IKI
Croziers bad visible, but almost surely present. Paraphyses almost not visible.
There are also hairs up to 100 um long, 5-6 um wide, that are a bit confusing (see photo).
Thank you in advance,
Iryna 
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Yatsiuk Iryna, 30-09-2016 17:48
Yatsiuk Iryna
Re : Yellow Hymenoscyphus?
Spores, asci, apical apparatus in IKI
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Hans-Otto Baral, 30-09-2016 18:13
Hans-Otto Baral
Re : Yellow Hymenoscyphus?
Hi Irina

the apical ring is of the Sclerotiniaceae-type. The sample reminds me  of Rutstroemia luteovirescens, but that is on Acer. There is an American species on Fraxinus petioles which was rarely also recorded in Europe: R. longipes. We discuss it in the H. fraxineus paper. I think there are real similarities with your sample. I attach a macro from the web:

K.E. LoefflerPhotographerLanzia longipes8/17/1999Lindsay-Parsons Biodiversity Preserve, West Danby, N.Y.leaf petioleCornell University. Plant Pathology Herbarium (CUP)CUP-LP-254

If you have the opportunity to collect this again please do vital studies, the living asci and paraphyses have never been figured.
Zotto
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Yatsiuk Iryna, 01-10-2016 23:28
Yatsiuk Iryna
Re : Yellow Hymenoscyphus?
Dear Zotto,
Thank you very much!
I'm afraid I will not be able to recollect it now, becaue actually a collection was made on 2 September and now I feel that there will be only Lanzia luteovirescens, but I'll keep it in mind.

This specimen was macroscopically different from L.luteovirescens in yellow color (without green tint) and short stalk. I know that the stalk is variable, but there were 5-6 fruibodies and all short-stalked.
I'll subscribe it as Rutstroemia cf. longipes for now and try to recollect it, than I'll send you information about living structures if you are interested.

Best regards,
Iryna
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Hans-Otto Baral, 02-10-2016 09:00
Hans-Otto Baral
Re : Yellow Hymenoscyphus?
I also think that we must not take stalk length as a character, except for species that are unable to form long stalks (many Phaeohelotium). 
I see on the photos that I have of this species that short-stalked apos actually occur (CUP_015905a), also in White 1941 p. 210.