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05-07-2025 12:38

Åge Oterhals

I found this pyrenomycetous fungi in pine forest o

01-06-2025 09:37

Charles Aron Charles Aron

Hi All, I found this Octospora growing with liver

06-07-2025 19:36

Castillo Joseba Castillo Joseba

me mandan el material de Galicia (España) recolec

07-07-2025 19:22

David Chapados David Chapados

Hi,Does anyone know what could this anamorph be?ht

02-07-2025 18:45

Elisabeth Stöckli

Bonsoir,Sur feuilles d'Osmunda regalis (Saulaie),

04-07-2025 20:12

Josep Torres Josep Torres

Hello.A fungus growing on the surface of a trunk o

20-06-2025 08:33

Josep Torres Josep Torres

Hello.Small, blackish, mucronated surface grains s

28-06-2025 16:00

Josep Torres Josep Torres

Hello.A tiny fungus shaped like globose black grai

04-07-2025 12:43

Castillo Joseba Castillo Joseba

me mandan el material seco de Galicia (España) 

03-07-2025 18:40

Castillo Joseba Castillo Joseba

me mandas el material seco de Galicia (España) re

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Lachnum rhytismatis
Chris Yeates, 06-06-2021 17:03
Chris YeatesBonjour tous

I think this is the taxon on Vaccinium myrtillus without croziers.

Presumably the major problem is that there is no type material of Phillips' original collection on Acer pseudoplatanus? The Vaccinium host would appear to have some significance, and that whatever we call it is a different species from this collection on a Quercus leaf? http://www.ascofrance.com/uploads/forum_file/Lachnum-cf-rhytismatis-0001.pdf.

An interesting feature of this collection is that several of the asci showed distinct "Psilachnum bodies" as can be seen in two of these images.
Regards, Chris
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Enrique Rubio, 06-06-2021 17:12
Enrique Rubio
Re : Lachnum rhytismatis
Hi Chris
Why not Lachnum microsporum Velen.?
Regards
Enrique
Chris Yeates, 06-06-2021 19:25
Chris Yeates
Re : Lachnum rhytismatis
Hello Enrique

I did wonder about that, and had looked at your images on AF and in Zotto's online database of images.

My main concern was that all these images show a distinctly stiped fungus and these were sessile (you can see the attachment "ring" in the 2nd image. To date I have only found these three apothecia but I have more leaves in the collection so will carefully check there. I have become very interested in the micro-fungi on Vaccinium myrtillus - a frequent plant close to where I live. For examplE I suspect there may well be an undescribed Micropeziza - http://www.ascofrance.com/search_forum/64691

I will see if I can find more apothecia of the Lachnum - I neglected to mention the spores were 5-5.6 x 1.3-1.6µm.

Best wishes, Chris
Chris Yeates, 06-06-2021 20:25
Chris Yeates
Re : Lachnum rhytismatis
I've just checked Velenovsky's protologue and there are a couple of issues. He describes Lachnum microsporum as "stipite tenui longo" which underlines my point above. There is the additional problem that the name Lachnum microsporum Velen. is invalid, being a later homonym of L. microsporum Torrend and therefore his fungus needs a new name . . .
Enrique Rubio, 06-06-2021 20:28
Enrique Rubio
Re : Lachnum rhytismatis
Perhaps Zotto has some ideas on this. He may have studied some holotype.
Hans-Otto Baral, 06-06-2021 21:10
Hans-Otto Baral
Re : Lachnum rhytismatis
I did not study the type as I remember, otherwise you must have seen my drawing. I was used to see lackin croziers on Vaccinium, but the matter with the croziers in correlation with the substrate was problematic. In the end, there was little DNA work on this, and the matter is not published (marketa was thinking about a new genus for the group).