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14-07-2025 11:20

Michel Hairaud Michel Hairaud

Bonjour, Voici une espèce de  (?) Hyaloscyphace

16-01-2023 21:31

Riet van Oosten Riet van Oosten

Hello, Nearby the find of Calycina claroflava on

14-07-2025 17:55

Yanick BOULANGER

BonjourAutre dossier laissé en suspendJe viens de

14-07-2025 11:17

Yanick BOULANGER

BonjourJ'ai un dossier Jackrogersella qui est rest

14-07-2025 15:52

Gernot Friebes

Hi,I wanted to share this collection on Rubus idae

14-07-2025 13:37

Gernot Friebes

Hi,do you think this collection could be R. ulmari

14-07-2025 11:19

Michel Hairaud Michel Hairaud

Bonjour, Voici une espèce de  (?) Hyaloscyphace

25-02-2023 18:36

Elisabeth Stöckli

Bonsoir, Trouvé sur un tronc de Salix recouvert

12-07-2025 16:45

Thierry Blondelle Thierry Blondelle

Bonjour à tous,J'avais d'abord pensé à des stro

05-07-2025 12:38

Åge Oterhals

I found this pyrenomycetous fungi in pine forest o

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Trimmatostroma - taxonomic position
Chris Yeates, 18-08-2023 19:01
Chris Yeates
Bonsoir tous

Mycobank and Index Fungorum both place this genus in the Helotiales, yet Genbank points to Mycosphaerellales, so clearly something odd is happening.

If you look at this collection on Genbank: https://www.ncbi.nlm.nih.gov/nuccore/EU019299.1 it clearly places Trimmatostroma in Mycosphaerellales. And yet it cites a related paper in Studies in Mycology 58 pp. 1-32 (2007) by Crous et al. "Mycosphaerella is polyphyletic" which contains the statement "the type species of the genus Trimmatostroma Corda, namely T. salicis Corda, as well as T. betulinum (Corda) S. Hughes, are allied (99 % bootstrap support) with the Dermateaceae (Helotiales)".

I find it hard to square this circle. Suggestions welcome.

Cordaliement, Chris
Hans-Otto Baral, 18-08-2023 21:00
Hans-Otto Baral
Re : Trimmatostroma - taxonomic position
I checled these three below, they all fall in Mollisia.

MK584996 Trimmatostroma salicis

=EU019300 Trimmatostroma salicis

which match an unpublished one by Guy Marson on Salix.

Closely related to T. salicis:

EU019299 Trimmatostroma betulinum

= MK584993 Trimmatostroma betulinum

Also not far from the above is

MZ571405 Trimmatostroma on Betula (Guy)

= AY354269 Mollisia sp. olrim132 (Lithuania, Betula pendula living stem)

Earlier Mollisia was treated in Dermateaceae, now in Mollisiaceae.

Zotto
Chris Yeates, 19-08-2023 12:30
Chris Yeates
Re : Trimmatostroma - taxonomic position
Thanks Zotto - that is exactly how I have interpreted the position, based on the Stud. Mycol. paper.

But I don't understand Genbank's repeated placement in Mycosphaerellales - presumably people are sequencing different strains that are far from the type material. I would have thought they would have better "checks and balances".

It again goes to show that using any of the databases - be it Index Fungorum, Mycobank, Genbank etc. they cannot be treated as gospel . . .

Chris
Hans-Otto Baral, 19-08-2023 13:59
Hans-Otto Baral
Re : Trimmatostroma - taxonomic position
When you look at the many taxa of Trimmatostroma in IF, you can see that some were combined into pyrenocarpous genera. This transfer from an originally anamorphic to a teleomorphic genus is quite frequent today, since 1F1N and the recommendation and conservation papers. IF is not adherent to Trimmatostroma in an antiquated sense, it only refers to the current nomenclatural synonym (binomial). So it seems nobody continues to use Trimmatostroma in the sense of a pyrenomycetous anamorph. The type of the genus is T. salicis and this can be considered as a Mollisia, though without knowing its perfect state as far as I know. I suppose some species described in Trimmatostroma are not yet clarified genetically.