Yellow Nectria (aff. pallidula?)

18-01-2019 22:14

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Yellow Nectria (aff. pallidula?)

Edvin Johannesen, 18-01-2019 22:14

Dear all,

This nectriaceous species was growing erumpent on twigs of old, but living plum tree (Prunus). Ascospores measure ca. 13 x 4-6 microns, and become warted and 1-septate at maturity. Is this sufficient for identification or does it need further studies?

Christian Lechat, 19-01-2019 06:20

Re : Yellow Nectria (aff. pallidula?)

Hi Edvin,

maybe your fungus is Bionectria. Vertical section through ascomatal wall could be very useful as well as the reaction in KOH and lactic acid. Please, check if there is an asexual state on the substrate or around the stromata, which should be clonostachys-like.

All the best,

Christian

Edvin Johannesen, 19-01-2019 11:36

Re : Yellow Nectria (aff. pallidula?)

Thanks, Christian. Do you mean cotton blue or plain lactic acid (which I do not have)? What to look for? Do you have a good article on Bionectria? I have limited access to literature on the internet.

Best regards,

Edvin

Edvin Johannesen, 19-01-2019 13:47

Re : Yellow Nectria (aff. pallidula?)

The ascomatal wall appears two-layered; an outer yellow and an inner hyaline layer. I have also tested iodine reactions. Neither Barals (alone) or Lugol after pre-treatment with 3% KOH gave any detectable staining.