Nectria on Salix bark - Forum ASCOFrance

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Nectria on Salix bark

Enrique Rubio, 29-01-2016 01:39

Hi again

These small (up to 0.35 mm), superficial, hairy, scattered perithecia grew on Salix bark, The ental layer of the walls turns lilac in KOH 10%, Ascospores verrucose. I don't know its anamorphic stage.

Have you some idea for help me?

Thanks in advance

Christian Lechat, 29-01-2016 06:00

Re : Nectria on Salix bark

Hi Enrique,
very nice specimen and images!
Maybe I know this species, I have a specimen collected by J.-P. Priou on Ulex, which resembles to yours. It could be a new genus in the Nectriaceae, which is in the course of study.

Best regards,
Christian

Enrique Rubio, 29-01-2016 09:33

Re : Nectria on Salix bark

Hi Christian

Is the lilac reaction of the internal perithecial layer present in your specimens?

Thanks a lot

Christian Lechat, 29-01-2016 10:07

Re : Nectria on Salix bark

Yes enrique, inner region of ascomatal wall turning purple in KOH and yellow in lactic acid.

Christian

Enrique Rubio, 29-01-2016 10:21

Re : Nectria on Salix bark

Thanks Christian

Marian Jagers, 22-02-2017 23:07

Re : Nectria on Salix bark

It looks like, I have found these funny perithecia too, on dead branches of Cytisus scoparius too (Enschede, The Netherlands). They are about the same sizes.
Ascospores are verrucose, mature a bit pink, some 2 times septated, 23 – 31,5(-37) x 9 11(– 12,5) µm. Asci J-, 8-spored, 80-94x14-16 µm. The innerwall purple in KOH.

Christian Lechat, 23-02-2017 05:25

Re : Nectria on Salix bark

Hi Marian,
your specimen seems identical to those collected by Jean Paul Priou on "pyreno" on Ulex and by Enrique on Allantoporthe tessella on Salix.

Is your specimen fungicolous?

Phylogenetic analysis places this fungus in the genus Macroconia (Nectriaceae).

All the best,
Christian

Marian Jagers, 23-02-2017 09:42

Re : Nectria on Salix bark

Hi Christian,

Sorry, I forgot to mention this. Indeed on stroma of Diaporthe inaqualis? or perhaps a Didymospaeria sp.? Both are rather common on this branches.
Most of the perithecia are empty so it is difficult to check without much dammage. First I hope to culture some more specimens of this Macroconia.
Thanks.

Marian

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