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Alex Akulov Alex Akulov

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Hi All,Recently I came across these minute, setose

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Riet van Oosten Riet van Oosten

Hello, Found by Laurens van der Linde, March 2024

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DAVID MARCOS DAVID MARCOS

Spores (telles qu'elles apparaissent à l'intérie

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Thierry Blondelle Thierry Blondelle

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• Scuttelinia: Macro and habitat.• S. scutella

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Lachnum pudibundum on Filipendula
Stefan Jakobsson, 18-06-2020 22:01
Here a Lachnum I am not quite sure about. It is white, to 0,6 mm diameter and stipe up to 0,9 mm. The surface blushes slightly on damage. The hairs are cylindrical or slightly clavate, fairly short, 20-50x3-4 µm, no chrystals. Eight spored, no croziers. The spores have no droplets:

(6.7) 8.2 - 10.4 (11.4) × (2.0) 2.05 - 2.6 (2.8) µm
Q = (3.2) 3.6 - 4.5 (4.7) ; N = 37
Me = 9.2 × 2.3 µm ; Qe = 4.0


The paraphyses are 50-65 x 4.7-6, with one or two bigger and some smaller droplets, protruding some 15-25 µm.


With these features I end up in subkey 4 of Zotto's key and there step 3 with three lignicolous species and an "unclear collection from Filipendula". This one was most probably growing on Filipendula ulmaria on a wet and swampy lake shore.


I compared to an L. pudibundum i found some weeks ago (on Prunus padus) and the main difference seems to be that the hairs are not capitate (with the exception of one hair) and the paraphyses are marginally more protruding. Is a host switch to Filipendula possible for L. pudibundum?

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  • message #63740
Hans-Otto Baral, 18-06-2020 22:33
Hans-Otto Baral
Re : Lachnum pudibundum on Filipendula
Hmm, I agree with the similarity with L. pudibundum.

In my key I cannot find Filipendula mentioned.

Filipendula stems are quite easily recognized from its smooth surface, not sure if this one is something else.

Zotto
Stefan Jakobsson, 18-06-2020 22:51
Re : Lachnum pudibundum on Filipendula
I peeled off the smooth top layer as the apos where in a crack under it.

This is what my key says.
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Hans-Otto Baral, 19-06-2020 09:27
Hans-Otto Baral
Re : Lachnum pudibundum on Filipendula
You are right, I looked in the wrong (old) version.

The collection from Marais Poitevin is unpreserved and I only made a few notes: Apoth. faintly changing red-brown, stipe up to 0.5 x 0.07 mm, spores *7-10 x 1.6-1.8, lipid 0-1, hairs 40-60, apex not or mostly slightly inflated (clavate), no crystals. Paraphyses broadly lanceolate, strongly protruding (no contents stated).

So yours has broader spores. But do you have a scale? I would like to remeasure the width.
Stefan Jakobsson, 19-06-2020 10:35
Re : Lachnum pudibundum on Filipendula
Here three photos with a scale. The scale is a bit strange though - you should pick e.g. the lefthand side margin of the two vertical end bars to get 10 µm.
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  • message #63748
  • message #63748
Hans-Otto Baral, 19-06-2020 12:29
Hans-Otto Baral
Re : Lachnum pudibundum on Filipendula
Thanks! With this I get 7.5-10.5 x 1.8-2(-2.2) which is closer to my measurements.
Stefan Jakobsson, 19-06-2020 13:10
Re : Lachnum pudibundum on Filipendula
Well, that is interesting, thank you! It seems I am doing some kind of systematical error then.
  • message #63751
Hans-Otto Baral, 19-06-2020 16:46
Hans-Otto Baral
Re : Lachnum pudibundum on Filipendula
These values I can confirm when taking the length as valid.
Stefan Jakobsson, 19-06-2020 19:28
Re : Lachnum pudibundum on Filipendula
Thank you for your help! Your notes match my fungus so well that I take it that they are the same. I'll will preserve it as Lachnum sp. (aff. pudibundum).