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30-08-2025 18:29

Rutstroemia
Joaquin Martin

Hi,I found this undetermined ascomycete on broadle

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Rutstroemia
Joaquin Martin, 30-08-2025 18:29
Hi,


I found this undetermined ascomycete on broadleaf wood in a botanical garden with many exotic trees.
The spores measure 19-22 x 4.7-5.4 µm.
I am thinking of Rutstroemia, but either the habitat or the spores do not match.
Any ideas?
Thank you.
  • message #83391
  • message #83391
  • message #83391
  • message #83391
Hans-Otto Baral, 30-08-2025 20:20
Hans-Otto Baral
Re : Rutstroemia
Why do you think R. firma does not fit? Spore size, shape and content  is o.k. for it. E.g. Huhtinen 1984 measured 19-23 x 4-5 for a sample on Alnus.

There is a R. alnobetulae which could alternatively fit. I remember the contents of the paraphyses stained blue in IKI, and the ectal excipulum is more gelatinous.