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Crescent Frost Lichen
Physconia perisidiosa
40.5359, -3.68194
Field Notes
Description:
Foliose lichen 3-4 cm wide, with a green thallus when wet, drying grey or grey-brown with tinges of mauve. It has small lobes , expanded towards the tips, with marginal and terminal lip-like soralia and isidiate towards the centre of the thallus. The upper surface is pruinose and the undersides ecorticate at the tips, with black and bottle-brush-like rhizines, and white medulla.
Apothecia are rare but when present have pruinose disks and have lobules around the disk margins.
Habitat:
Widespread but local on nutrient-rich bark, rarely on walls.
This one was found on the bark of a Holm oak at 700 meters over the sea level.
Notes:
The oak on whose bark was this lichen was completely covered by at least then different types of lichens., some of them I have not yet identified.
Camera Model: NIKON D300
Exposure Time: 1/10 sec. f/9
ISO 100
Focal Length: 90.0 mm
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