#Pyxine sorediata

[lichenaday]

Pyxine sorediata

Mustard lichen

This foliose lichen grows in radiating patches up to 8 cm across. It has flat or slightly concave, subdicotomous lobes which are pale blue-green or gray on the upper surfaces and brown-black and densely rhizinate on the lower surface. It produces soredia from pseudocyphellae along the lobe margins, as well as from rounded soralia on the lobe surface. And inside the lobes, the medulla (fungal hyphal layer) is yellow, giving P. sorediata its common name! It rarely produces apothecia, which are black and up to 1.4 mm in diameter. This little guy grows on mossy bark and rock in temperate or subtropical regions worldwide.

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