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12-02-2009 22:01

Hans-Otto Baral Hans-Otto Baral

Today I received from Pablo fresh Lambertella on O

10-02-2009 22:18

Jean Pierre Dechaume Jean Pierre Dechaume

Bonsoir à tous, S'il vous plaît, sauriez-vous m

10-02-2009 21:44

Christian Lechat Christian Lechat

Here is a new species for France

09-02-2009 16:36

Roland Labbé

Bonjour ! Voici une planche d'un Discomycète q

08-02-2009 20:36

Pablo Chacón Pablo Chacón

Forêt siliceo de Quercus suber, trouvée entre Er

08-02-2009 18:28

Edouard Evangelisti Edouard Evangelisti

Bonjour à tous ! Je voudrais soumettre à votr

07-02-2009 17:49


Bonjour, Un collègue a fait une récolte étonn

06-02-2009 19:07

dominique cosnier

Je désire connaître le nom du genre et de l'esp

06-02-2009 09:19


Bonjour, Encore des problèmes avec un diable de

05-02-2009 23:14


I've made another recolt on Equisetum, E.arvense i

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Minute pyrenomycete on Olea leaves
Hans-Otto Baral, 12-02-2009 22:01
Hans-Otto BaralToday I received from Pablo fresh Lambertella on Olea leaves, and during study I discovered a very small pyrenomycete. Any idea?

Perith. 70 µm diam, globose, black, with some dark brown short stiff setae around the ostiole which I did not see. Asci *14-19 x 7.7-8.5 µm, 8sp., hardly any vacuole water around, IKI-, thin-walled all over (also in dead state). Sp. *7.5-9 x 2.3-2.5 µm, 1-septate, eguttulate.

  • message #6664
Hans-Otto Baral, 12-02-2009 22:02
Hans-Otto Baral
Re:Minute pyrenomycete on Olea leaves
squashed perithecium
  • message #6665
Hans-Otto Baral, 12-02-2009 22:03
Hans-Otto Baral
Re:Minute pyrenomycete on Olea leaves
3 apparently living and one dead ascus. Spores appear to slip out of a sheath.
  • message #6666
Jean-Pierre Lafont, 13-02-2009 00:12
Re:Minute pyrenomycete on Olea leaves
Hello Zotto
Were the ascomas surrounded by spots of a black powdery coating? Actually it looks like a "sooty mould". The size of the ascostromata , the 1-septate hyaline ascospopres and the presence of hyphal appendages are suggestive of family Antennulariellaceae. Usually, in mature ascospores, one of the sister cells is broader than the other one, which seems to be the case for at least one of the spores of your Figure 3. Unfortunately, the literature on this group is scarce, dated and difficult to find. See Hughes, 1976, Mycologia LXVIII, 693-821. I am anything but an expert of this group, and this is only a suggestion...
Hans-Otto Baral, 13-02-2009 00:25
Hans-Otto Baral
Re:Minute pyrenomycete on Olea leaves
Dear Jean-Pierre

The Antennulariellaceae, hug, belong in the Capnodiales, Dothideomycetes, according to Eriksson's Outline of genera. I know quite well the fact that species with bitunicate asci often have such asymmetrical spores with the upper cell broader. But here I had the feeling they are very much equal, and the asci are really thin-walled. Maybe the one spore looks asymmetrical because it lies oblique and is only partly sharp. But let us see the opinion of others.