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24-12-2025 17:08

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Karstenia guttulata?
Garcia Susana, 17-01-2014 13:12
Hi all

Apothecia inmersed, 0.4mm diameter. Hymenium light. Lobed margin. on hardwood.
Apex of paraphyses and asci are embedded in a gelatinous substance that keeps them together.
Asci 8-spored, 70-80 x 11-12um. With apical apparatus IKI visible (IKI +)
Spores cylindrical, up 72x2.7um, and 15 septa when mature. spirally arranged in the ascus.
Ectal Excipulo with prismatic texture (x3-6um), marginal cells 10-12 x 3-4um.

With the information that I have, I think it can be Karstenia, and as having apical apparatus: Karstenia guttulata.


I would like someone to confirm or reject this determination.


Greetings.
Susana

  • message #26865
  • message #26865
  • message #26865
  • message #26865
Hans-Otto Baral, 17-01-2014 15:56
Hans-Otto Baral
Re : Karstenia guttulata?
Interesting collection.

What I name rubrobrunnea-guttulata has straight spores. Yours are distinctly helicoid.

I fear I do not know this. You figure a detail auf the "excipulum", is it from the inner face of the marginal lobes? I suppose so, it is the periphyses that point horizontally to the hymenium.

Was it an attached branch?

Zotto
Garcia Susana, 17-01-2014 19:40
Re : Karstenia guttulata?
Hi Zotto

Photo excipulum take it in a bulk sample, no cutting, and I considered that was the excipulo. Now, I have noticed a cut and I could see that these terminal cells, are in contact with the hymenium, horizontally. (sent photo, although is not very good)


The branch that grew, was attached to the tree.


Susana

  • message #26868
Hans-Otto Baral, 17-01-2014 20:01
Hans-Otto Baral
Re : Karstenia guttulata?
Fine, this is exactly what is typical of Karstenia (but not Cryptodiscus), and also occurs e.g. in Stictis.

I must apologize, the right word is periphysoids, at least it is the term that Sherwood uses. In the dictionary periphysoids is used for pyrenomycetes, however, and also periphyses is there defined for perithecia, as elements lining the ostiolar canal and directed upwards. I am not really sure why Sherwood uses periphysoids here.

Zotto
Garcia Susana, 17-01-2014 20:08
Re : Karstenia guttulata?
Hi Zotto.

Thanks for the info.
I can say that this is Karstenia sp. ? (undetermined)

Hans-Otto Baral, 17-01-2014 20:35
Hans-Otto Baral
Re : Karstenia guttulata?
Yes, I think so. (quite sure). Helicoid spores were so far unknown to me in that genus.

As it was an attached branch, the whole tree was dead, or why  you cannot say what host genus it was?
Garcia Susana, 19-01-2014 21:09
Re : Karstenia guttulata?
Hi Zotto

I checked the substrate. It was an attached dead branch. The whole tree is still alive, and it is a salix.

Regards
Hans-Otto Baral, 19-01-2014 21:33
Hans-Otto Baral
Re : Karstenia guttulata?
Thanks!