Mollisia pteridis - Forum ASCOFrance

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Mollisia pteridis

Enrique Rubio, 27-04-2020 01:39

Following the thread of Lieve Deceuninck's message in this same forum http://www.ascofrance.com/search_forum/48820 about Mollisia pteridis Gillet, I have found several cupulate and sessile ascomata up to 0.5 mm in diameter, KOH negative, on blackened parts of Pteridium aquilinum rachis. The exccipulum is hairy and formed by a brownish textura angularis which on the flanks of the fruitbodys forms septate, long and pigmented hairs, while on the margin these are also long but hyaline.
The paraphyses have small vacuoles that stain in cresyl blue, but do not contain the large cylindrical and refractive VBs typical of the genus Mollisia.
This fungus that Ellis & Ellis assimilate to Mollisia pteridis and that fits very well with the drawings they make of the lateral and marginal hairs, could also fits with Gillet's succinct description.
What do you think?

Hans-Otto Baral, 27-04-2020 09:02

Re : Mollisia pteridis

Dear Enrique

would you min sending me your pics per mail? They are too small to seee the details.

Surely this is a Pyrenopeziza or because of the hairs perhaps a Pirottaea. I have a folder "Pyrenopeziza rubi on Pteridium", at first glance I think it is the same. One of the collections is by Peter Thompson, and he considered this to be Fuscolachnum pteridis, which cannot be because that species has warted hairs. His remark about this are quite interesting, and I have not the time to go deeper now, but I think it is worth pasting part of his statement here (but I see that your link gives similar information):

"Ascofrance has some entries under this name, in particular Enrique Rubio's entry dated 26 June 2009, which does look quite similar to mine. The resemblance to the sketch which Ellis & Ellis made for the fungus which they called Mollisia pteridis Gillet is quite striking. Last time, we did note that M. pteridis (Albertini & Schweinitz) Gillet is the correct scientific authority. Perhaps the similar E&E description and sketch for Dasyscyphus pteridis (Albertini & Schweinitz) Massee is actually another collection of the same fungus."

Enrique Rubio, 27-04-2020 10:29

Re : Mollisia pteridis

Hi Zotto
Obviously it is not Fuscolachnum pteridis and I don't think it can be a Pirottaea either. Morphologically, with these submarginal or lateral long brownish septate hairs, it even remember me Pyrenopeziza escharodes.
Of course it is the same fungus in your "Pyrenopeziza rubi on Pteridium" folder.

Hans-Otto Baral, 27-04-2020 10:30

Re : Mollisia pteridis

Yes, I overlooked that the hairs are thin-walled. Pyrenopeziza species may be rather host-specific, so it could well be that Pteridium has a species of its own.

It is interesting how the apos in this sample grow on a blackish zone. Not sure if this is typical.

Charles Aron, 27-04-2020 22:33

Re : Mollisia pteridis

Hi,

I seem to have found the same fungus on Pteridium which I IDed as Mollisia pteridis from E & E. I have to admit that I thought the hairs (c40 long) quite conspicuous for a Mollisia.

Best wishes,

Charles.

Hans-Otto Baral, 28-04-2020 09:55

Re : Mollisia pteridis

Yes, this looks so. Was it immature? Also here the apos seem to seat on darkened patches.

Charles Aron, 28-04-2020 20:02

Re : Mollisia pteridis

Hi Zotto,

Yes, the apos were immature and I've had to wait some time for asci and ascospores to appear which agree with Mollisia pteridis sensu E & E.

Charles.

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