Calicium glaucellum  

Thallus usually immersed, rarely superficial, with an indistinct, pale grey or dark grey-green granular thallus.
Anamorph: conidiomata pycnidia, frequent. Conidia 4-5 × ca 0.8 μm, narrowly cylindrical.
Teleomorph: ascomata stalked mazaedial apothecia, 0.5-0.9 mm tall, 2-4 times as high as the width of the stalk, shiny black, usually with a faint white pruinose region at the edge and below the head, I–. Head 230-350 µm diam., obovoid to lens-shaped; stalk 100-170 µm diam. Asci 34-41 × 3.5-4.5 μm, cylindrical, evanescent. Ascospores uniseriately arranged, 9-13 × 5-6.5 μm, ellipsoidal to fusiform-ellipsoidal, sometimes breaking apart at the ± median septum, thick-walled, dark grey-brown, with irregular cracks and ridges on the surface.
Chemistry: thallus K± dull yellow (sekikaic, 2-O-methylsekikaic, 4-O-methylhypoprotocetraric and physodic (±) acids by TLC).