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28-05-2020 21:28

Marek Capoun

Hello everybody,I need help with a determination o

29-05-2020 11:28

Maria Plekkenpol

Hello, on cowdung I saw these whitish asco's. Foll

29-05-2020 20:14

Maren Kamke Maren Kamke

Good evening,A pyrenomycetes-species on rosa sp.,

28-05-2020 11:45

Hardware Tony Hardware Tony

Found this hairless orange operculate fungi larges

29-05-2020 14:08

Louis DENY

Bonjour forum,Dans un endroit humide, sur feuille

14-03-2014 18:08

Roland Labbé

Bonjour ! Voici un Roseodiscus subcaneus probable

28-05-2020 10:46

Josep Torres Josep Torres

Hola. Aunque no es el Foro más adecuado para el t

16-05-2020 12:30

Hans Halbwachs

Dear all, I have found quite a few spores in Balti

18-12-2019 13:39

Peter Thompson

Hello Everyone,I have found what appears to be an

24-05-2020 22:36

Joop van der Lee

The reason why I post all these different characte

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Scutellinia sp. - please help with identification
Markov Sergey, 21-10-2019 21:53
I found small Scutellinia species on very wet very rotten wood of Populus tremula and Betula pendula in Russia near east of Moscow region (left from match - on Populus, right - on Betula).

Ascomata size is up to 5 mm of pale orange color. Marginal hairs up to 1.5 mm long (may be longer, I measured only seven hairs) and up to 42 um wide, non-septate, at base from non-furcate to multifurcate.

Ascospores ellipsoid or broadly ellipsoid, (17.57) 19.03 - 20.66 (21.70) × (11.84) 12.38 - 13.60 (14.19) µm; Q = (1.39) 1.47 - 1.58 (1.67); N = 49; Me = 19.78 × 13.01 µm ; Qe = 1.52. Ornamentation very small, mostly invisible in light microscope, most spores visible as smooth, but contains rare "big" warts up to 0.2...0.3um high. Ornamentation visible in lactic CB, contains ultra-small to small warts, some rare bigger warts and ridges, and some rare mesh-like structures. Paraphyses clavate, some septate, some moniliform.

I checked several versions - S.crinita (apothecia too small; spore ornamentation not suitable), S.kerguelensis (hairs too long, non septate), S.nigrohirtula (Qe too small, hairs too long, aseptate), S,setosissima (Southern specie, should not be found in my region), S.olivascens (hairs too long, Qe may be smaller than needed). I think that none of this versions are suitable.

Please help with identification.
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Malcolm Greaves, 22-10-2019 08:48
Malcolm  Greaves
Re : Scutellinia sp. - please help with identification
How about S scutellata?
Markov Sergey, 22-10-2019 11:31
Re : Scutellinia sp. - please help with identification
According to T.Schumacher (1990) S.scutellata has ascospores with warts with height of 0.5...0.9 um, clearly visible in light microscope. Spores of my Scutellinia sp. visible as almost smooth with 100x oil lens in Melzers reagent and in lactic CB. Ornamentation visible only in CB as pattern on spore surface, but not as relief on spore periphery. Warts, that are visible as relief, have maximum height of 0.2...0.3 um are very rare, hard to find, and may be also artefacts. i'm not sure that they are true warts.
If this (almost smooth mature spores with ornamentation visible as pattern, but not as relief) in conjunction with small ascomata is normal for S.scutellata, this may be acceptable version.

There are two new microphotos (in Melzer's). I previously did not pay attention to this, but immature spores have a clearly visible ornamentation, warts with height up to 0.7 um, that disappears on mature spores.

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Malcolm Greaves, 22-10-2019 23:21
Malcolm  Greaves
Re : Scutellinia sp. - please help with identification
The sculpturing often changes when spores are ejected. Sometimes smaller sometimes greater so mature spores should always be used. S crinita is described as having minute sculpturing.
Markov Sergey, 27-10-2019 18:25
Re : Scutellinia sp. - please help with identification
Thank You. S crinita was my first version. I was later confused with some microphotos of S.crinita ornamentation, but these photos was mixed up. I reviewed Schumachers's description and drawings, and S. crinita seems to be almost suitable. Only with a minor incongruities - according to Schumacher S.crinita has simple septate paraphyses, and i see moniliform paraphyses in my species, and the spore ornamentation of my species looks lower than in the Schumacher's description (mainly invisible under 100x oil immersion lens as relief). Is this OK for S.crinita?
Malcolm Greaves, 27-10-2019 23:15
Malcolm  Greaves
Re : Scutellinia sp. - please help with identification
I would accept it.