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31-08-2025 17:32

Michel Hairaud Michel Hairaud

Bonjour, Pas d'identité trouvée pour cette réc

31-08-2025 19:41

Enrique Rubio Enrique Rubio

Hi to someone.I need to download this issue of Sve

31-08-2025 14:34

Thomas Flammer

I have found a Rutstroemia on abt. 2000 m on Alnus

29-08-2025 19:04

Thomas Flammer

Spores 21.2 - 26.2 x 8.3 - 11.3 µm - Q: 2.20 - 2.

30-08-2025 18:29

Joaquin Martin

Hi,I found this undetermined ascomycete on broadle

28-08-2025 17:24

Thomas Flammer

I know, that this is not the real topic of this fo

29-08-2025 05:16

Francois Guay Francois Guay

I think I may have found the teleomorph of Dendros

24-08-2025 21:59

Edmond POINTE Edmond POINTE

Bonsoir amis mycologues,Trouvé sur crottin de che

27-08-2025 12:02

Pavol Palo

Hello dear friendsI would like to ask for sharing

25-08-2025 17:37

François Freléchoux François Freléchoux

Bonjour,Nous avons trouvé samedi dernier à l'ét

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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).