A yellae crottle

Crottle is a symbiotic jynin o a fungus (the mycobiont) thegither wi a photaeseenthetic pairtner (the photaebiont, kent as the pheecaebiont an aw) that can mak fuid for the crottle frae sunlicht.

Crottle for ordinar growes on stanes, stane-dykes an trees.

In the bygane mony ferm an cot-hooses haed their ain baurel o graith, or putrit pish (ammoniac), an a lit pig, for tae mak reid or purpie dye for tae hue claes.