Leprose lichen

A leprose lichen is a lichen with a powdery or granular surface.[1] Leprose lichens lack an outer "skin," or cortex.[1] If a crustose lichen starts to disintegrate, it will appear powdery, but crustose lichens will leave a cortex surface, and leprose lichens do not.[1][2] Leprose lichens have no inner or outer cortex. They sometimes have a weak kind of medulla, but are composed mainly of the fungal hyphae and an algae.

Acacia bark covered in green Leprose lichen.

References

"Lichen thallus types, illustrated (Alan Silverside's photographs of lichens (FAQ))". www.lichens.lastdragon.org.
teacher, Gordon RamelGordon is an ecologist with two degrees from Exeter University He's also a; Poet, A.; of 1, The Owner; Oh -, 152 books; Website, He Wrote This (December 29, 2019). "Lichen: The Lovable & Unique Symbiosis Of Nature".

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[ASLTT-1] "Lichen thallus types, illustrated (Alan Silverside's photographs of lichens (FAQ))". www.lichens.lastdragon.org.

[2] teacher, Gordon RamelGordon is an ecologist with two degrees from Exeter University He's also a; Poet, A.; of 1, The Owner; Oh -, 152 books; Website, He Wrote This (December 29, 2019). "Lichen: The Lovable & Unique Symbiosis Of Nature".