Diaporthale on Geranium - Forum ASCOFrance

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Diaporthale on Geranium

Enrique Rubio, 08-06-2018 18:33

Hi to everyone
This enigmatic diaporthale makes subepidermial, roundish, blackish, up to 250 microns in diam., perithecia with central short beak on overwintered stems of Geranium pratense at the sea level.
Thes short stipitate asci have a conspicuous refractive melzer negative apical apparatus and the non septate ascospores have polar roundish caps at the poles, only visible with chlorazol blak.
I explored keys on Gnomonia-like fungi with no success.Have you some idea for me?
Many thanks in advanceEnrique

Alain GARDIENNET, 08-06-2018 19:46

Re : Diaporthale on Geranium

Hi Enrique,

This amazing fungus is probably new.

Alain

Enrique Rubio, 08-06-2018 20:13

Re : Diaporthale on Geranium

Hi Alain
Could you suggest me a genus?

Enrique Rubio, 08-06-2018 20:15

Re : Diaporthale on Geranium

First, I tought in Apiognomonia, by the spore morphology, but any septa I have seen. Maybe Gnomoniella?

Alain GARDIENNET, 08-06-2018 20:53

Re : Diaporthale on Geranium

Yes, because of a pseudoseptum on Melzer-photo, I thought at Apiognomonia too, but is it really a septum ? I don't think. Find the genus is difficult without molecular data, you know . Gnomoniella ? not impossible. I've no more knowledge than you.

Sorry,

Alain

Enrique Rubio, 09-06-2018 00:55

Re : Diaporthale on Geranium

Yes. I tought this was a septum in Melzer's reagent, but since I never saw it again, I didn't think it was really a septum. Even in chlorazol black it never showed up again.
Thank you for help me, Alain.

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