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Olla or Urceolella?
Francois Guay,
07-05-2025 18:29
I found this small hyaline ascomycete on moist, decorticated deciduous wood. I suspect it might belong to Olla or Urceolella; does anyone have an idea what it could be?- Spores 7.7-9.9 x 2.24-3.5 µm
- Asci 8 spored, IKI+
Here is the iNat link for photos:
Here is the iNat link for photos:
Kosonen Timo,
07-05-2025 19:01
Re : Olla or Urceolella?
Lovely!
I assume Urceolella (cf. appressipila). KOH should do atleast some damage if not make the hairs burst completely. Olla wouldnt take any hit + usually some dextrinoid reaction.
There's a lot to be done with Urceolella. This should find its way to herbarium.
Timo
I assume Urceolella (cf. appressipila). KOH should do atleast some damage if not make the hairs burst completely. Olla wouldnt take any hit + usually some dextrinoid reaction.
There's a lot to be done with Urceolella. This should find its way to herbarium.
Timo
Hans-Otto Baral,
07-05-2025 22:27
Re : Olla or Urceolella?
Definitely no Olla which never has a lumen in the glassy part. Urceolella is good, and I also suspect 5% KOH-solubility of the glass.
I have a folder "hirta-like on wood, 8-10 x 3-4 µm", and I think yours is the very same species as that from Spain named "Urceolella, II.2016". The finder J. Balda wrote: This I found on wet Populus wood, could be U, graddonii? It is the closest I've seen, but that grows on leaves. U. hirta is the valid name for U. graddonii and U. salicicola.
Francois Guay,
08-05-2025 05:34
Re : Olla or Urceolella?
Thank you both, Timo and Zotto. It does look very similar to Urceolella (cf. appressipila). Does it grow on decorticated wood? It also looks nearly identical to this Urceolella, II.2016 from Spain. I believe my specimens were also on Populus wood. Was it sequenced? I will send mine to DNA sequencing.
Kosonen Timo,
08-05-2025 07:18
Re : Olla or Urceolella?
Yeah, my concept at the moment is that U. hirta is a "leaf-species". And then there is atleast one species on deciduous wood (also on Populus here in Scandinavia) which I think is (or is close to) appressipila. Also I think there are more than one species (cf appressipila) on wood. But that's a very very working hypothesis - a hunch if you may. --- The hairs of U. hirta and U. appressipila are somewhat similar, but in hirta they are undulating and curly where as in appressipila the hair is more like on one - or one and a half - huge curve - not a corkscrew.
Appressipila is _relatively_ easy to find if there's ample dead soft wood, but hirta not so easy :-) ..takes that one perfect leaf-spot and the exact right moment.
Timo
Appressipila is _relatively_ easy to find if there's ample dead soft wood, but hirta not so easy :-) ..takes that one perfect leaf-spot and the exact right moment.
Timo
Hans-Otto Baral,
08-05-2025 11:01
Re : Olla or Urceolella?
I know of no sequence of U. hirta and allies. Maybe Javier Balda kept his specimen.
Francois Guay,
08-05-2025 20:32
Re : Olla or Urceolella?
Thank you both! I will call this Urceolella cf. appressipila for now, and see if sequencing helps.
Zotto, do you have Javier Balda's email address?
Hans-Otto Baral,
08-05-2025 20:39
Re : Olla or Urceolella?
Try the following:
Search in Ascofrance for Balda, open his post and click on his name. You will find his address.
Francois Guay,
08-05-2025 20:42
Re : Olla or Urceolella?
Will do! Thanks