Ciborinia en aulnaie à ail des ours

05-06-2015 19:24

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Ciborinia en aulnaie à ail des ours

Bernard CLESSE, 05-06-2015 19:24

Bonsoir à tous,

Pouvez-vous me donner une piste pour ce Ciborinia greffé sur sclérote noir en forme de banane, trouvé en aulnaie à ail des ours dans un mélange de matière organique (feuilles) pourrissantes et terre mêlée ?

a) asques IKI+
b) spores étroitement ellipsoïdes à ovales : 9-12,5x2,5-4,5
c) certaines spores présentent une enveloppe hyaline qui se détache (cf. spore1)
d) paraphyses filiformes, septées, certaines flexueuses au sommet
e) excipulum à textura globularis

Bernard

Lothar Krieglsteiner, 05-06-2015 20:37

Re : Ciborinia en aulnaie à ail des ours

Hi Bernard,

can you tell us how many spores are in the asci? In your picture I see 4, but the foto maybe shows not the whole ascus.

Regards from Lothar

Hans-Otto Baral, 05-06-2015 20:52

Re : Ciborinia en aulnaie à ail des ours

tres characteristique especes! The banana-shape, long and thin stipe, and occurrence in Alnetum leave no doubt about what Lothar surely also thoght: Sclerotinia capillipes.

This is usually 4-spored but 8-spored apothecia also occur. Uwe Lindemann wrote an article on it for which I also supplied data. here attached.

Zotto

Lindemann-2011-Sclerotinia-capillipes-0002.pdf

Lothar Krieglsteiner, 05-06-2015 20:55

Re : Ciborinia en aulnaie à ail des ours

yes, Zotto, you are right - I also thought of Sclerotinia capillipes :-)

Bernard CLESSE, 05-06-2015 21:00

Re : Ciborinia en aulnaie à ail des ours

Big thank you to Patrice Tanchaud (who offered me the name of species) as well as Lothar and Zotto for your confirmations and documentation on this Sclerotinia !

I'll check the number of spores per ascus in 30 minutes.

Bernard

Hans-Otto Baral, 05-06-2015 21:22

Re : Ciborinia en aulnaie à ail des ours

The genus Ciborinia is surely better for this species because of tracheids in the sclerotial medulla, but that genus is today questioned again....

Bernard CLESSE, 05-06-2015 22:41

Re : Ciborinia en aulnaie à ail des ours

Good evening all,

I redid one preparation and I have predominantly observed 4spored-asci but sometimes with 3, 5, 6 or 8 spores !

Here are some more pictures of spores and paraphyses. Paraphyses are slightly swollen at the top and the spores are finally : 6-13x2,5-4,5

Bernard

Hans-Otto Baral, 06-06-2015 08:46

Re : Ciborinia en aulnaie à ail des ours

Thanks! The interesting thing is that the spores are binucleate in 4-spored asci, because there are no aborted spores. This seems to mean that the 8 nuclei are going as pairs in the spores. In 8.spored asci the spores should then be uninucleate. This is unusual because in some other species of Sclerotiniaceae 4 spores abort early and are then much smaller than the other four.

Nuclei are difficult to see. usually staining with IKI helps.

Bernard CLESSE, 06-06-2015 08:52

Re : Ciborinia en aulnaie à ail des ours

OK Zotto, great thanks for this information.

Bernard

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