Ciboria (?) en xérobrometum - Forum ASCOFrance

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Ciboria (?) en xérobrometum

Bernard CLESSE, 13-12-2017 10:41

Bonjour à toutes et tous,

J'ai trouvé hier en pelouse calcicole xérique très rase (xérobrometum) ce petit asco qui me fait penser à un Ciboria.

a) diamètre apothécie : 2,5 mm
b) longueur pied : 2 mm
c) spores elliptiques-subfusiformes, à 2 guttules polaires : 18,5-21x8,5-9 µ
d) asques IKI+
e) excipulum à textura globosa, à cellules brunes, les terminales hyalines et cylindro-clavées
f) paraphyses hyalines, à peine élargies à l'apex.

Bernard

Lothar Krieglsteiner, 13-12-2017 11:15

Re : Ciboria (?) en xérobrometum

Hi Bernard,

I think this is Sclerotinia trifoliorum.

You have overlooked the sclerotia.

Look at your ascus-foto - you see 4 small and 4 larger spores.

The habitat is quite typical, the species is quite common in meadows, but mostly only solitary or few ascomata.

Best regards, Lothar

Bernard CLESSE, 13-12-2017 11:22

Re : Ciboria (?) en xérobrometum

Big thanks for your answer Lothar!

Do you know the potential hosts of this Sclerotinia because in this environment there is to my knowledge no Trifolium but many other Fabaceae (Hippocrepis, Anthyllis, Medicago…) ?

Best regards,

Bernard

Lothar Krieglsteiner, 13-12-2017 15:34

Re : Ciboria (?) en xérobrometum

Hi Bernard,

I fear I cannot help you with this - perhaps the species is not very specialized.

Best regards from Lothar

Bernard CLESSE, 13-12-2017 15:45

Re : Ciboria (?) en xérobrometum

OK Lothar, thank you.

Bernard

Martin Bemmann, 13-12-2017 16:01

Re : Ciboria (?) en xérobrometum

Dear Bernard,

check this database: https://nt.ars-grin.gov/fungaldatabases/fungushost/fungushost.cfm

there are a lot of hosts for S. trifoliorum!

Best regards
Martin

Bernard CLESSE, 13-12-2017 16:14

Re : Ciboria (?) en xérobrometum

Great thanks Martin !

I see that Medicago, Lotus corniculatus and Anthyllis could be hosts of Sclerotinia trifoliorum, which may be suitable.

Best regards,

Bernard

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