Lichens

 I love seeing lichens after rain, when they transform from dry scabby coatings to almost iridescent grey, green, purple, yellow, etc shapes and patterns on rocks, bark, and wood, which fires my imagination.
according to Wikipedia ‘a lichen is a composite organism that arises from algae or cyanobacteria (or both) living among filaments of a fungus in a symbiotic relationship. The combined life form has properties that are very different from the properties of its component organisms.’
The algae/cyanobacteria produce sugars by photosynthesis that they share with the fungi in exchange for protection, moisture and minerals. They are very tough, occurring from desert to tundra and very old. They evolved at least 400 million years ago and live longer than most organisms.
Breaking news: all lichens also contains another fungus that coats the other 2 participants and holds them together. Everything you want to know about lichens can be found on this website.

Lichens do not affect living organisms, but rely on air, water, dust,  and minerals derived from acids that they exude into underlying rock and organic matter.

Mixed colony

Yellow lichen at Yornaning

Cladia aggregata Boyagin rock

Usnea sp. (green), Haematomma sp. (red)

Flavoparmelia sp on mallee nut