Ascomycota > Lecanoromycetes > Pertusariales > Pertusariaceae.
Pertusaria has over 500 species of crustose lichens known as wart lichens.
The thallus surface may take various forms – thick or thin, smooth or with various degrees of cracking or wrinkling.
It may be greyish-white, yellowish-white, a pale greyish green, or brown.
There are no isidia or soredia but there are numerous wart-like apotheca up to 1.5 mm across.
The apotheca may be:
- immersed in small wart-like mounds of stroma with small openings on the top for spore release or
- lecanorine apotheca on the thallus with the thalline margin the same colour as the thallus.
Among Queensland species P. hermaka and P. thiospoda have a greenish thallus.