Hi to all

My friend J. Linde, a great discover of minute fungi, collected these small, white, downy, shortly stipitate, briefly cupulate later pulvinate apothecia, 0.3-0.5 mm in diameter on seeds (samara) of Acer pseudoplatanus. 

Thea asci, 8-spored, are IKI negative and with croziers. The spores have only few minute guttules. Excipulum with textura + or - prismatica. The paraphyses are cylindrical, without conspicuous Vb's in water but stain in Crb. Close to the margin they become branched as the excipular hairs (marked with red arrows in the pic).

The very dense excipular hairs have finger-like protuberances as the Mollisina species. I think it could be a Mollisina but I don't know a species that fits well with our fungus.

 

Thanks for your opinion

Enrique Rubio, 29-04-2014 18:29

Re : Mollisina (?) on seeds (samara) of Acer pseudoplatanus

Salut Guy

My first idea was this species with IKI reddish asci and without croziers (fide Zotto). So I think is not possible.

Thanks

Stip Helleman, 29-04-2014 19:16

Re : Mollisina (?) on seeds (samara) of Acer pseudoplatanus

Hi Enrique,
I agree with that species concept although I did note for my acerina collection IKI rb besides in acerina the spores are more ovoid (less pointed than in this collection). The only Mollisina I know with croziers is also undescribed on Pteridium leaves

regards,
Stip

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Enrique Rubio, 29-04-2014 19:39

Re : Mollisina (?) on seeds (samara) of Acer pseudoplatanus

Thanks, Stip. Thanks for your opinion

Hans-Otto Baral, 30-04-2014 21:09

Re : Mollisina (?) on seeds (samara) of Acer pseudoplatanus

There is a collection from Chemnitz which fits:

HB 9340, Chemnitz, Acer fruit. Ap. 0.3-0.6 mm diam., whitish, Calycina-like. Sp. cyl.-fusoid-clavate, *5-6.5 x 1.8-2 µm, Ölm.0,5-1. Asci ca. *28-37 x 5-6 µm, IKI 2rb, very dirty red. Hairs on exterior only as cortical cells with many small finger-like outgrowths. Exudate over exterior light golden-yellow.

I suppose it was with croziers, but my photos do not clearly show. I had it in the folder of Stip's one on Pteridium. I have kept the material and hope to reexamine it at some time.

Zotto

Enrique Rubio, 01-05-2014 20:14

Re : Mollisina (?) on seeds (samara) of Acer pseudoplatanus

Hi Zotto

Your HB 9340 fits well but 'my asci' have any reaction in IKI. I'm very sure of it!

Thanks! 

Hans-Otto Baral, 01-05-2014 21:00

Re : Mollisina (?) on seeds (samara) of Acer pseudoplatanus

Ah, you mean your asci have no reaction to Lugol. Mine are medium strong first blue then dirty red (= 2rb), I know you understood. Well, Mollisina is another crazy genus....