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Leptoshaeria? on Quercus
Martin Bemmann, 02-09-2010 00:32
Martin BemmannHi,

this one is from a dead branch of oak, still attached to the trunk in approx. 2 m height above ground. The branch is completely decorticated and covered by algues, lichen etc. I found Orbilia aprilis and some pyrenos on it amongst them this one:
It has obpyriforme perithecia, with a leathery to "carbonized" peridium. Size is c. 185µm width by 40 µm height. Most of those ascocarps are superficial but some are also partly immersed in the decorticated rotten wood. The spores are fusiforme and multiseptated (41,8-46,2 x 5-6,4 µm).
My guess is a Leptosphaeria, but....
Maybe some of you will recognize this one.
>
Best regards,

Martin
  • message #12752
Martin Bemmann, 02-09-2010 00:33
Martin Bemmann
Re:Leptoshaeria? on Quercus
a single one...

  • message #12753
Martin Bemmann, 02-09-2010 00:41
Martin Bemmann
Re:Leptoshaeria? on Quercus
and spores:
  • message #12754
Bernard Declercq, 02-09-2010 11:22
Bernard Declercq
Re:Leptoshaeria? on Quercus
Hi Martin,
Spores are rather assymmetrical, uncommon for a Leptosphaeria.
Did you observe bitunicate asci?

Bernard
Hans-Otto Baral, 02-09-2010 18:36
Hans-Otto Baral
Re:Leptoshaeria? on Quercus
Maybe it is this one? I regret I have only dead photos, but I noted this to have multiguttulate spores when alive. Asci unitunicate. I compared my fungus with Chaetosphaeria.

HB 6170c. Tübingen-Pfrondorf, 400m, on very rotten branch of Quercus (wood), 28.VI.1998, H.-O. Baral & G. Marson (HB 6170c)Assoc.: "Fuscolachnum mollisioides, Durella connivens Waldrand, Hang zur Schlucht, Qu-Carp-Acer camp-Frax-Fag-Wald, ca. 3m above ground, ca. 1m long. branch, near tip, 15-20mm thick, decort., strongly algae-covered. Asci unitunicate, Spores *38 x 5,3 µm, hyaline, strongly fusoid, ca. 14 celled, many minute LBs.
  • message #12768
Martin Bemmann, 03-09-2010 13:08
Martin Bemmann
Re:Leptoshaeria? on Quercus
Hi Bernard and Zotto,

thank you for yuor comments. Here are some pictures of the asci in IKI, that maybe help.

Best regards

Martin
  • message #12782
Martin Bemmann, 03-09-2010 13:08
Martin Bemmann
Re:Leptoshaeria? on Quercus
another:
  • message #12783
Martin Bemmann, 03-09-2010 13:09
Martin Bemmann
Re:Leptoshaeria? on Quercus
still more:
  • message #12784
Martin Bemmann, 04-09-2010 23:27
Martin Bemmann
Re:Leptoshaeria? on Quercus
Hi,
I made a new preparation with CB to find out if there is a visible apical aparatus. I think there are parts staining different and one can imagin an annulus... ;-)

Cheers

Martin
  • message #12792