Anthostomella? - Forum ASCOFrance

05-09-2013 20:44

Anthostomella?

Marcus Yeo

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Anthostomella?

Marcus Yeo, 05-09-2013 20:44

I collected this pyrenomycete on dead stems of Ononis repens. I have been puzzling over it for a long time without coming to a conclusion on its identity.

Using the limited literature I have available, I think it's an Anthostomella species.

The perithecia are ca 0.1-0.2 mm across . Asci are cylindrical, 65-80 x 5-6 µm. Tips stain blue in Melzer's. Spores are uniseriate in the ascus, brown, 8-10 x 3-4 µm. I can't see any sign of an appendage on the spores.

If anyone has any suggestions, I would be very grateful.

Merci

Marcus

Chris Yeates, 05-09-2013 22:34

Re : Anthostomella?

Hello Marcus
can you see a (possibly faint) germination slit on the spores? Anthostomella has a tendency to appear on monocot's, though not exclusively. A. limitata is plurivorous, and has spores in this size range, but for the time being I am being cautious . . .

I can send you Sheila Francis' Anthostomella monograph (Mycol. Pap. 139 (1975) ) if you are interested . . .

best wishes
Chris

Jacques Fournier, 05-09-2013 23:01

Re : Anthostomella?

good evening Marcus,
microscopy fits well Anthostomella but in that genus ascomata are typically imersed under a clypeus. It is not clear to me on your photo whether ascomata are superficial or immersed in the substrate. Otherwise I agree with Chris that A. limitata would be a possible candidate. The signature of this species is a spiralling germ slit to the ascospores, often hard to make out, try a very thin slide in 3% KOH, it may help. Also try to make a vertical section across the fungus to see if it is immersed under a clypeus.
Good luck,
Jacques

Marcus Yeo, 05-09-2013 23:18

Re : Anthostomella?

Hi Chris

It would be great if you could send me the Anthostomella monograph.

I couldn't see a germ slit on the spores but didn't look very closely.

A. limitata does seem to be a possibility. I considered A. tomicoides and A. clypeoides, which have also been recorded on a range of host species, but the spores aren't right.

Marcus

Marcus Yeo, 05-09-2013 23:26

Re : Anthostomella?

Jacques

Thanks for your suggestions. I'll have a closer look.

The perithecia are superficial.

Marcus

Gernot Friebes, 07-09-2013 09:40

Re : Anthostomella?

Hi Chris,

I'd be very interested in the Anthostomella monograph as well. Thanks in advance!

Best wishes,
Gernot

FRANCIS FOUCHIER, 07-09-2013 11:02

Re : Anthostomella?

Hi Chris,

I'd be also very interested in the Anthostomella monograph as well. Thanks in advance!

Best wishes,
Francis

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