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Ascomycete with Dark, Tapering Hairs
Peter Thompson, 13-02-2013 12:26
Hello Everyone,

I have fruit bodies of a spherical ascomycete resting on decorticated wood. They have tapering hairs with bulbous bases and macroscopically resemble Lasiosphaeria and related genera. (See attached photograph).

Microscopically, there are about 20 pale brownish 1-septate spores, which have remained inside each of the two perithecia which I have examined. (See attached sketch). I have not seen any asci. 

My feeling is that it is a mature ascomycete, but quite old. If so, it has probably also been exposed to freezing temperatures and snow.

I wonder if anyone is aware of a species which possesses a combination of these spore and hair characteristics. My literature search has been unsuccessful.

Thank you,
Best wishes,
Peter. 
  • message #21870
  • message #21870
Alain GARDIENNET, 13-02-2013 12:29
Alain GARDIENNET
Re : Ascomycete with Dark, Tapering Hairs
It could be closed to  Helminthosphaeria genus.
Did you observe asci and hamathecium ?
Sorry, I read the answer in your first mail. So it would be more difficult to have an opinion.
Alain
Peter Thompson, 13-02-2013 15:16
Re : Ascomycete with Dark, Tapering Hairs
Hello Alain,

Thank you for your reply.

I did not observe any asci - I think that the fruit bodies were probably too old. Only a few loose spores had been retained in the perithecia which I analysed.

I did not mention earlier that each fruit body seems to be seated on a brown, thick walled, septate hyphal subiculum about 2.5 to 3um wide. This subiculum is only located directly under each fruit body, rather than extending across the substrate.

I don't know whether this helps.

Best wishes,
Peter.