Nectria on Salix - Forum ASCOFrance

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Nectria on Salix

Jenny Seawright, 02-04-2015 22:41

Hello all,

I found a patch of Nectria on a living branch of Salix cinerea in damp woodland - perithecia yellow becoming orange and then red, slightly darker at the apices, the surfaces appearing rough but not strongly warted. Spores were hyaline, 1-septate, (15)17-20 x 7µm.

Using Ellis & Ellis Nectria veuillotiana seemed a good possibilty until I compared the perithecia with those shown here:
http://www.ascofrance.fr/search_recolte/2149

Once again assistance appreciated!
With regards,
Jenny

Christian Lechat, 03-04-2015 06:42

Re : Nectria on Salix

Hi Jenny,

Are the ascospores ornamented or smooth?
Your fungus fits better Thelonectria discophora.

Best wishes,
Christian

Jenny Seawright, 03-04-2015 23:44

Re : Nectria on Salix

Hi Christian - my first reply disappeared so this is the next attempt!

Thank you - the texture and apices of the AscoFrance images of Thelonectria discophora correspond perfectly with what I was seeing down the microscope.

"Are the ascospores ornamented or smooth"
I wasn't quite sure what I should be looking for but have added some images in Cotton Blue.
Attempted images of a perithecia section - fortunately someone has kindly offered to do a 'proper' section for me......

With regards,
Jenny

Christian Lechat, 04-04-2015 06:03

Re : Nectria on Salix

Jenny,
your image (from left) suggests that the ascospores observed in water are spinulose. This characteristic fits well to T. discophora.
Best gegards,
Christian

Jenny Seawright, 04-04-2015 09:53

Re : Nectria on Salix

Thank you very much Christian
Jenny

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