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13-06-2025 09:41

Josep Torres Josep Torres

Hello.A cerebriform ascomycete sprouting scattered

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Hello, Nearby the find of Calycina claroflava on

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Asco on Heracleum
Nick Aplin, 29-01-2013 22:25
Salut à tous,

I have been struggling with this little ascomycete found last week on dead Heracleum stems just above snow-level in the South of England:

Apothecia sessile to subsessile, to 0.3mm. Yellowing with age
Spores 12 - 15.1 x 4.5 - 6.1 µm mainly 1-septate in the asci, finally 2-septate at maturity
Asci tips with no reaction to iodine
Croziers present 

Thank you for your ideas,

Nick

  • message #21527
  • message #21527
Hans-Otto Baral, 29-01-2013 23:05
Hans-Otto Baral
Re : Asco on Heracleum
The colour looks greenish on my screen,but is it perhaps whitish in reality? It is not sure that the spores are 1-septate at maturity, I suspect they are ejected aseptate, because the ascus with septate spores has a strong apical thickeing, so this ascus is surely dead.

The excipulum sketsch shows flanks and margin? Does not look like Parorbiliopsis.  No idea.

Zotto
Nick Aplin, 30-01-2013 01:30
Re : Asco on Heracleum
Hi Zotto,

Thanks for your thoughts.

Yes the apothecia were whitish.

Thats interesting - It makes sense that some of the asci were dead - I kept the fungus alive for a couple of days before illustrating it.

I saw very few (none?) aseptate spores outside of the asci unless I squashed the preparation under the coverslip.

It reminded me of images I have seen of Allophyllaria, but that can't be correct with a negative iodine reaction, right?

Nick
Hans-Otto Baral, 30-01-2013 08:12
Hans-Otto Baral
Re : Asco on Heracleum
Allophylaria has a thick-walled excipulum (+/- oblita), of elongat cells. Yours seem thin-walled and +/- isodiametric.

But Allophylaria is usually deep red (hemiamyloid), thoughrarely inamyoid.