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Dear Theo, I wonder what is your opinion about the arista?
I figure that it will be difficult to reach a species level but Tschorsnig's keys begin by describing the arista. I think that the arista are only thickened at the base which leads to one species: hemichaeta. The info about hemichaeta seems to fit well.

hemichaeta can be found from April to end of May. I found this in mid may. The others are supposed to be active from June onwards but they are supposed to have much thicker arista. Cinerea is supposed to be out in April but the arista doesn't match.

Do you think that this could be hemichaeta?

I'm sorry if my text is confusing. I need to sleep soon...
I will fix the missing photos tomorrow. Let me know if you want to view larger photos.

Goodnight.