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Rot BojanHello, by appearance I would say that I am dealing
unknown tiny discomycete
Khomenko Igor,
17-06-2021 15:54
For the last few years, I and others were finding this tiny discomycete of rotten logs. One specimen was on Acer saccharum. Unfortunately, we couldn't put a name on it. I hope someone will recognize it. It is not something uncommon here in Ottawa, ON, Canada.Apothecia 0.1-0.3mm, sessile.
Asci 8-spored, IKI+bb, croziers(+), 70-90x9-11um.
Ascospores multiguttulate, OCI=4-5, 11-15x4-5um.
Paraphyses filiform with VBs and often forked at the top.
Excipulum wasn't observed. Probably without.
More pictures are here:
https://inaturalist.org/observations/82329023
Hans-Otto Baral,
17-06-2021 17:13
Re : unknown tiny discomycete
I guess you mean hooked instead of forked? An excipulum is undoubtedly present. I recommenc to put an apo upside down on a slide and view on the exterior, especially at the margin. There could be small hairs. Textura is important to know in any case.
Khomenko Igor,
17-06-2021 18:18
Re : unknown tiny discomycete
Thanks for the advice. I found some marginal cells filled with fast-moving guttules (they were gone after KOH) and ectal excipulum (probably with globulosa or angularis textura) near the base.
No, I meant forked, or maybe a better term would be branching and not only at the top.
No, I meant forked, or maybe a better term would be branching and not only at the top.
Hans-Otto Baral,
17-06-2021 20:59
Re : unknown tiny discomycete
This looks interesting, I did not imagine that, because in the upper paraphysis cells the VBs look large and motionless compared to those. Such moving VBs occur in some Helotiaceae such as Cyathicula but also in Lachnum. Surely the drops in the paraphyses do not disappear in KOH.
Yes, the exciple is isodiametric at the base but elongated at the flanks and margin. The paraphyses look really hooked, while I would be surprised to see a forked upper cell with VBs inside. Anyway I believe you now.
I am far from an idea. A Pezizellaceae could be, but not sure.
Khomenko Igor,
17-06-2021 23:15
Re : unknown tiny discomycete
Thank you Zotto. Then I will be looking in Pezizellaceae .
Paraphyses with small VBs that disappear in KOH. I tested it. It is difficult to photograph VBs.
Overmatured spores at first with 1 and later with 3 septa.
Paraphyses with small VBs that disappear in KOH. I tested it. It is difficult to photograph VBs.
Overmatured spores at first with 1 and later with 3 septa.
Hans-Otto Baral,
18-06-2021 10:10
Re : unknown tiny discomycete
Surely VBs in paraphyses disappear - I meant the drops in the spores.
The second photo looks a bit like being rehydrated? So now also in the paraphyses the VBs are minute and trembling.
Yes, I guessed that the spores get septate.
Khomenko Igor,
18-06-2021 14:17
Re : unknown tiny discomycete
I thought all pictures are from living material, but recent shots may come from drying out sample. There are trembeling VBs in paraphyses, but mostly in the lower parts. In top parts they packed too tight to move.
And yes, drops in spores do not react to KOH.
And yes, drops in spores do not react to KOH.
Miguel Ángel Ribes,
19-06-2021 11:35
Re : unknown tiny discomycete
Good morning
I think it is the same than this from Tenerife: http://www.ascofrance.fr/search_forum/58248
Miguel Angel
I think it is the same than this from Tenerife: http://www.ascofrance.fr/search_forum/58248
Miguel Angel
Khomenko Igor,
19-06-2021 14:45
Re : unknown tiny discomycete
Thank you Miguel.
It is definitely the same species. Now I just need to hope that one of you could find a name for it.
It is definitely the same species. Now I just need to hope that one of you could find a name for it.
Hans-Otto Baral,
19-06-2021 15:46
Re : unknown tiny discomycete
Thanks Miguel, I could not remember. Now I see I have it in Rodwayella, a weird, probably wrong placement. The curved paraphyses are noted in both samples. I see a macrosc. similarity with Polydesmia, but no relationship.
Miguel Ángel Ribes,
19-06-2021 23:22
Re : unknown tiny discomycete
Yes, the first species that Ruben and me thought when we saw it was Polydesmia pruinosa.
Wonderful, Canada and Tenerife joined by a tiny micro Asco with no name.
Wonderful, Canada and Tenerife joined by a tiny micro Asco with no name.
Hans-Otto Baral,
20-06-2021 09:00
Re : unknown tiny discomycete
I compared Polydesmia dumontii but that has 4-spored asci and too narrow spores, besides inconspicuous flexuous hairs at the margin.
Miguel Ángel Ribes,
20-06-2021 20:59
Re : unknown tiny discomycete
Yes, in 2019 I checked Polydesmia species, but none fits.
Are you thinking about a new species into Polydesmia genus?
Sequencing it could be a good idea.
Miguel Ángel
Are you thinking about a new species into Polydesmia genus?
Sequencing it could be a good idea.
Miguel Ángel
Hans-Otto Baral,
20-06-2021 21:30
Re : unknown tiny discomycete
No, I only think that when you study the fungus in dead state, then you could think it is a Polydesmia. But the VBs would be very unusual, as is the absence of hairs and lack of frequent paraphysis branching.
Miguel Ángel Ribes,
21-06-2021 08:19
Re : unknown tiny discomycete
Ok, thanks Zotto.
Miguel Ángel
Miguel Ángel