Hello,
I found a strange (to me) coelomycete growing as well on fallen needles of Picea abies as on Cladonia digitata growing at the foot of the tree.
Description: Conidiomata solitary, sessile, on the squamules and podetia of Cladonia digitata, cushion-like to suborbicular, black, 100–150 µm in diam., opening by radially splitting of the wall (habitually like the peristome of bryophytes); wall brown, composed of one layer of pseudoparenchymatous cells, 1–2 µm thick, cells in surface view more or less in radial lines, rectangular, c. 3–4 × 4–4.5 µm; pycnidial cavity first filled with thin-walled, hyaline, isodiametric cells, 3–4 µm diam., later these cells are dissollving, some of them turning to broadly ampulliform conidiogenous cells, 4–6 × 3.5–5 µm; conidia non-septate, ellipsoid, hyaline, both ends rounded, with one minute guttule near each end, (3.5–)4.1–5.3(–6.0) × (2.0–)2.1–2.7(–3.0) µm, l/b = (1.3–)1.7–2.3(–2.8) (n = 20).
Strange to me is the splitting of the pycnidial wall and the conidiogenous cells developing inside the lumen and not on the inner side of the wall. Fist idea was Rhizospaera, but this has other pycnidia. Actinothyrium has fitting pycnidia, but here the conidia are filiform. Can anyone help?