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Nemania (probably) on Betula pendula
Peter Thompson,
27-09-2013 13:18
I recently found perithecia with papillate ostioles extending significantly above the surface of small, effuse stromata. The perithecia are completely embedded such that no perithecial mounds can be seen with a hand lens. The substrate is well rotted wood of Betula pendula. There are no KOH extractable pigments.
Because of the size of the spores, the closest species which I can find is Nemania gwynedii, but the spores in my sample are becoming dark brown, rather than the pale brown associated with this species.
I have attached an image of the fruit bodies and a sketch of the microscopy and wonder if anyone can help with the identification.
Thank you,
With Best Wishes,
Peter.
Jacques Fournier,
27-09-2013 14:50
Re : Nemania (probably) on Betula pendula
Hello Peter,
your find matches well Nemania confluens that is often more or less immersed in the rotten wood. Asci and ascospores fit well too. Nemania gwyneddy has superficial sromata and paler brown ascospores with a short germ slit, unlike the one you illustrated.
Nemania confluens is a very tricky species, often misleading, thus be careful!
cheers,
Jacques
your find matches well Nemania confluens that is often more or less immersed in the rotten wood. Asci and ascospores fit well too. Nemania gwyneddy has superficial sromata and paler brown ascospores with a short germ slit, unlike the one you illustrated.
Nemania confluens is a very tricky species, often misleading, thus be careful!
cheers,
Jacques
Thomas Læssøe,
27-09-2013 15:33
Re : Nemania (probably) on Betula pendula
based on Peter's drawing the shape of the amyloid plug looks odd for confluens and also the rather flat side of the spores? - but the stroma looks very much like confluens. I am confused :-)
Peter Thompson,
27-09-2013 17:14
Re : Nemania (probably) on Betula pendula
Hello Thomas and Jacques,
Thank you for your replies.
Some of the spores were certainly looking flat along one edge, depending on their orientation. Others were slightly curved.
I also seemed odd that they were growing on wood of Betula.
Thank you,
Peter.
Thank you for your replies.
Some of the spores were certainly looking flat along one edge, depending on their orientation. Others were slightly curved.
I also seemed odd that they were growing on wood of Betula.
Thank you,
Peter.