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29-06-2016 15:18

Scopinella
Per Vetlesen

HiIt was found on the bark of a dead branch of Jun

07-01-2018 22:47

Scopinella?
Per Vetlesen

Grown in moist chamber on bark/resin of fallen Pin

06-04-2026 15:04

Gnomoniaceae
David Chapados David Chapados

Hi! Could someone help me identifying this specim

06-04-2026 21:36

Literature search
Viktorie Halasu Viktorie Halasu

Hello, could anyone please send me the article wi

06-04-2026 19:40

Nectriaceae on Fagus
David Gibbs David Gibbs

Help with this one much appreciated, on rotting Fa

06-04-2026 11:07

Arachnopeziza delicatula
Louis DENY

Bonjour forum, Trouvé sur bois de feuillu très d

06-04-2026 16:24

Helotiales on Pinus needles
Juuso Äikäs

Last Tuesday I found some tiny white Helotiales gr

05-04-2026 13:33

Mollisia sp?
Sylvie Le Goff

Bonjour à tousPuis avoir votre avis sur ce champi

05-04-2026 20:40

Unknown helotiales on Abies bark
Robin Isaksson Robin Isaksson

Hi!Found i Japan on bark of Abies sp. Spores 35-4

06-04-2026 08:15

minute hairy discomycete from Portugal - Fuscolachnum?
Lothar Krieglsteiner Lothar Krieglsteiner

some days ago, on the lower surface of leaf of Que

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Tiny asco on Fallopia
Camille Mertens, 03-04-2023 12:39
Hi all.

Collected on Fallopia end of january.
Spores slighty curved, guttulated, wrapped in a sheet : 11-12 x 3,6-3,9 µm
Ascus with croziers, IKI (-)
Branched paraphysis.

Seems to me closed to Allophylaria "petasites" on Zotto's webside illutrations.
An idea?
Best regards.

Camille
Hans-Otto Baral, 03-04-2023 14:44
Hans-Otto Baral
Re : Tiny asco on Fallopia
Hi Camille

that is indeed similar, although Björn measured (9-)10,3-12,4x2,6-3µm.

Your IKI I do not much trust, or you need to remove the KOH better, or even better let KOH away and show what IKI does.

The marginal excipulum doe snot look like an Allophylaria, in Björn's specimen the cells are elongate and thick-walled (gel). Did you also see VBs in the paraphyses that get red-brown in IKI by extruding red granules?

Zotto
Camille Mertens, 03-04-2023 19:43
Re : Tiny asco on Fallopia
Hi Hans

I agree this does not fit an Allophylaria.
IKI was negative. Therefore I tried KOH pretreatment.
I cannot remember a red-brown reaction in IKI.
I add a photo of paraphysis in Crb.
Many thanks.

Camille
  • message #75755
Hans-Otto Baral, 03-04-2023 20:25
Hans-Otto Baral
Re : Tiny asco on Fallopia
Sorry, these paraphyses are dead, there I cannot see anything. They must be alive, best in water. Not sure how to proceed. The excipulum near the base could be helpful too.

I see a minute reactive (amyloid) ring in your ascus (KOH+IKI). But since the photo does not show any iodine colour (yellow-brown), I wonder how this would turn at higher IKI concentration.
Camille Mertens, 03-04-2023 20:39
Re : Tiny asco on Fallopia
Many thanks Hans.

Gonna try to collect new ones.