Athallia holocarpa forme lignicole.
=Caloplaca holocarpa forme lignicole.
Caloplaca holocarpa grp.
This form is distinguished from the type by its occurrence on damp dead wood by the sea, the thallus is very thin, greyish, stained with blackish (cyanobacteria?), its apothecia are numerous and of variable coloring depending on the hydration, more yellowish if wet, more orange if dry. Asci with 8 spores, utriforme, 60-70 x 10-15 µm according to our measurements. Polarilocular hyaline spores, elliptical, 10-15 x 4-5 (6) µm with an equatorial thickening of 4-7 µm according to our measurements. Photobiont: green algae other than Trentepohlia. Thallus: C-, K-, KC-, P-, Apothecia: C-, K+ purple, KC+/- purple, P-. Coastal species growing on bark, bare wood, hardwoods or conifers (here Cupressus), in the aerohaline zone.
N.B. Species of the Athallia holocarpa group very similar to Athallia cerinelloides whose habitat is more continental and which has larger and especially wider spores.