Identification key
Candelariella sp.
(1) Candelariella sp.
Description
Thallus
Crustose, more or less adherent to the substrate, formed of granules of variable size (0.05–2 mm), giving some species a powdery appearance. The determination to the species level requires a microscopic observation to measure the granule size.

Color
Mustard yellow, greenish-yellow or yellow-orange
Reproduction
Apothecia: present in some species, about 1 mm in diameter, disc darker in color than margin (3)
Soralia: present in some species, like very small granules (0.05 mm)
Isidia: absence
Risk of confusion
Candelaria concolor, with a foliose thallus
Ecology
Substrate
On bark, rock, or artificial substrate

Habitat
Slightly nitrophilous

Occurrence
Common

Sensitivity to air pollution
Resistant to pollution

(2)
(3)