First two photos are at mature stage. The remaining photos go backwards to immature stages.
Brown immature plasmodium and forming fruiting bodies is unusual; usual this species is white or yellow when immature.
Thanks to @malacothrix for finding these.
in moist chamber #478 20/04--01/06/2024 on bark of Crataegus rhipidophylla.
sample on the rignt Ø= 0.43mm.
Spores 8.7-9.5 µm.
AM 5385-3