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01-12-2023 21:54

Marian Jagers Marian Jagers

Does anyone recognize this species? Apothecia in

04-12-2023 08:32


Bonjour, récolte réalisée au sol dans un parc,

04-12-2023 10:01

François Bartholomeeusen

Dear forum participants, On a thin twig of Myrica

03-12-2023 19:21

ruiz Jose antonio

Hola a todos, en un talud cercano a un riachuelo,

28-11-2023 23:10

Villalonga Paco

On basic soil in humid bank, Teruel, Spain, around

02-12-2023 21:21

Elisabeth Stöckli

Bonsoir, Récolte en milieu incendié, apothécie

25-11-2023 14:49

Kees van Oorde Kees van Oorde

Very small fruiting bodies on affected leaves. Fou

30-11-2023 14:33

Béatrice Senn-Irlet

alll issues of Mycologia Helvetica (1983-2000) are

28-01-2014 10:50

Gernot Friebes

Hi,I'm looking for these three standard references

25-11-2023 18:14

Danny Newman Danny Newman

higher resolution images available at inaturalist.

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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: 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which match an unpublished one by Guy Marson on Salix.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.

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 . . .

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.