Black Mollisia on Salix - Forum ASCOFrance

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Black Mollisia on Salix

Michel Hairaud, 06-09-2023 21:45

Bonsoir,

Je ne trouve pas d'identité pour ce Mollisia récolté sur branche de Salix au sol et ayant un aspect de Patellaria atrata: Apothécies 0,5-1,5 mm, noirâtres, sans marge relevée, à surface externe sublisse.
Asques 60-65 x 5 , PS 22 µm, spores 6-8 x 2-2,2 µm, OCI 0,5 (1)
Paraphyses x 4-5 µm
Cellules de l'ectal à parois brun rouge foncé , de diamètre jusqu'à 18 µm
Cellules marginales courtes, la dernière : 15-17 x 5-8 µm
KOH négatif

Merci pour tout indice.
Amitiés
Michel

Hans-Otto Baral, 07-09-2023 10:18

Re : Black Mollisia on Salix

Hi Michel,

this is all but easy. maybe the apothecia got dark with age and were more grey when young?

I cannot exclude M. cinerea, although that species was surely applied for a number of different taxa in the past.

Zotto

Michel Hairaud, 07-09-2023 11:18

Re : Black Mollisia on Salix

Thanks Zotto for your answer,
M. cinerea is among the closest species which can be compared , indeed.
at least for spore shape and OCI,

Moreover it appears that even the smallest or new developped specimens are that black . Another feature seems distinctive: there is no white rim on the margin
But there are collections in your cinerea folder which look very similar

Amitiés
Michel

Hans-Otto Baral, 07-09-2023 11:35

Re : Black Mollisia on Salix

My folder is surely heterogeneous. Our experience with Mollisia is that without the combination with DNA no good concept can be achieved in many of the taxa.

Ingo Wagner, 10-09-2023 16:16

Re : Black Mollisia on Salix

Hi Michel!

Normally the spores of your find are too short and narrow for M. cinerea.
Mollisia cinerea is in my opinion a species of the half-year approximately from november-april.

Take a look here at Zotto's IVV to this relatively recently described species:
https://drive.google.com/drive/u/0/folders/1bxySecfsFmqs9gYxo5tRg7JHileyLd_7?tid=0B5SeyOEkxxZhYVZub0N1aGY5YTg

Shape and color of apos could be a problem though.
Or it's just a new, undescribed one.
There are really quite a few of them.

Greetings
Ingo

Hans-Otto Baral, 10-09-2023 20:38

Re : Black Mollisia on Salix

One must add that Ingo's collection there was sequenced and falls to Mollisia novobrunsvicensis by 99.8% (1 Nukleotide deviation in ITS). Without this sequence we would not have been sure what it is. But there are more sequences from Europe that fall here, e.g. one by Brian Douglas (SW 19).

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