Chaenothecopsis debilis (Turner & Borrer ex Sm.) Tibell

Syn.: Calicium debilis Turner & Borrer ex Sm.
Non- or doubtfully lichenised.
Substrate: lignum
Altitudinal range: from the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus) to the subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron)
Note: on dry and weathered lignum of deciduous trees (Populus, Fraxinus, Ulmus), more rarely on conifers, in open situations, often in hollows of the trunks in species-poor stands; probably overlooked and more widespread, but never common.
Switzerland: Schwyz; Italy: Friuli;