Dear forum members,

In a newly mown, very humid, flowery meadow on the very wet edge of a brook my friend found several ascomata on a herbaceous plant. My first thought was Stictis but turned soon into Grodronia with the following characteristics:

Macroscopic: the fruit bodies break through the epidermis and when removed they leave an identation in the plant. No stroma found. First they are deeply cup-shaped and later they spread out into a light grey disc of +/- 1 mm. In an early stage the excipulum forms a serrated edge, later and in humid condition the grey hymenium rises above the excipulum.

Micoscopic:
Asci: 63 x 7 µm, IKI- and no croziers
Paraphyse: filiform 56-70 x 3-3,5 µm, septated
Spores: filiform, 41,92-65,47 x 2,46-3,66 µm; GEM= 52,35 x 3 µm ; Q= 17,4

I can't determine the substrate. I think a herb rather than wood.
I have little literature and with the key I have I come to Godronia cassandrae. But there are several deviations: I find no clear croziers, no reaction in IKI or Melzer and no woody substrate. The stem is hollow and round with a diameter of 2,5 mm and I notice a red-purple discolouration.
Can someone help me with this discovery, thank you in advance.

Best regards,

François Bartholomeeusen