description Physcia stellaris Overview
Physcia stellaris is a foliose lichen in the family Physciaceae that forms pale gray, often orbicular thalli with loosely appressed lobes. It is distinguished from many related Physcia species by the absence of soredia and isidia, while dark, plate-like apothecia are commonly present. It grows chiefly on the bark of deciduous trees, but also occurs on rock across temperate parts of North America and Europe.
help Physcia stellaris FAQ
What kind of lichen is Physcia stellaris?
Physcia stellaris is a foliose lichen in the family Physciaceae. It forms pale-gray, often rounded thalli with loosely attached lobes.
How can Physcia stellaris be distinguished from related Physcia lichens?
A useful field clue is that Physcia stellaris lacks soredia and isidia, the powdery or outgrowth-like structures used for asexual reproduction in many lichens. It also commonly develops dark, plate-like apothecia.
What do the apothecia on Physcia stellaris do?
The dark, plate-like apothecia are the lichen's visible sexual reproductive structures. Their presence can help separate Physcia stellaris from similar pale-gray Physcia species.
Does Physcia stellaris have a leafy or crusty growth form?
It has a foliose, or leafy, growth form rather than a tightly crusted one. Its pale thallus is made of loosely appressed lobes that can form an orbicular outline.
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