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06-05-2025 13:37

Thomas Flammer

Munk, Anders (1953). The System of the Pyrenomycet

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Andreas Jacob

Good evening, due to contstant drought I started

07-05-2025 18:29

Francois Guay Francois Guay

I found this small hyaline ascomycete on moist, de

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Francois Guay Francois Guay

I found this white, hairy ascomycete on the bark o

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Ethan Crenson

Hello all, I was looking at leaves of Yucca from

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Castillo Joseba Castillo Joseba

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Thomas Flammer

I have found on Genistae sth. that looks like puli

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Nicolas Suberbielle Nicolas Suberbielle

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Castillo Joseba Castillo Joseba

Me mandan el material de Galicia (España),  reco

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Castillo Joseba Castillo Joseba

Me mandan el material de Galicia (España),  reco

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Rutstroemia from a Bosnian mountain
Nihad Omerovic, 28-09-2023 22:11
Hello,
Looking for opinions on this Rutstroemia; I considered R. alnobetulae - spore size, shape and content match, but there's no IKI blue reaction with paraphyses.

Date: 10. 09. 2023.
Habitat/substratum: peat bog fragment around a mountain stream, 1800 m elevation, with Alnus, Salix, Pinus mugo, on a dead twig, possibly from Alnus glutinosa.

Spore size: Me = 26.5 × 6.2 µm ; Qe = 4.3 (some over 28 µm)
Asci: around 170 µm, croziers +

Could not make proper section - ascoma was gelatinous and then kind of squishy.

Last picture is twig section.
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  • message #77010
Nihad Omerovic, 28-09-2023 22:13
Re : Rutstroemia from a Bosnian mountain
Macro
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Nihad Omerovic, 28-09-2023 22:20
Re : Rutstroemia from a Bosnian mountain
spores
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Nihad Omerovic, 28-09-2023 22:22
Re : Rutstroemia from a Bosnian mountain
paraphyses, ascus tip IKI
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  • message #77013
Nihad Omerovic, 28-09-2023 22:23
Re : Rutstroemia from a Bosnian mountain
sections
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Hans-Otto Baral, 29-09-2023 09:50
Hans-Otto Baral
Re : Rutstroemia from a Bosnian mountain
Alnus is the only possible genus among the three trees you mentioned. You can verify it by a radial section by looking for the ladder-like perforations.

Spores etc. fit that species. I am not sure how constant this reaction of the VBs is. The VBs look correct. Also I am not sure if this reaction works on herbarium material.
Nihad Omerovic, 29-09-2023 23:27
Re : Rutstroemia from a Bosnian mountain
Thank you.

Radial section:


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Hans-Otto Baral, 30-09-2023 20:33
Hans-Otto Baral
Re : Rutstroemia from a Bosnian mountain
Sorry I failed to say that you must hit the vessels. The rows of larger cells in your cross section show such ladders in radial section. Vessels are often very abundant but here they are more scattered. Bad luck!
Nihad Omerovic, 01-10-2023 19:08
Re : Rutstroemia from a Bosnian mountain
Thank you for the explanation.
I made several cuts/photos but posted only these two.
Could this be the "ladder"?
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Hans-Otto Baral, 01-10-2023 20:36
Hans-Otto Baral
Re : Rutstroemia from a Bosnian mountain
Yes it is, very good. So it is clearly a Betulaceae and only Betula comes in consideration besides Alnus.