Physcia adscendens (Fr.) H. Olivier
Hooded rosette lichen, rosette lichen
Hooded rosette lichen is common along the east and west coasts of North America.
Identification: Technically, this is a foliose lichen. It has an uneven branching pattern, and thickened branches, but they are not flat against the branches as with some lichens. The lichen is a powdery pale gray to greenish gray in color, sometimes with a yellow portion. It is very common. This is often found together with Physcia tenella. It appears on twigs and bark, as well as concrete and other walls, and occasionally on rocks.
Habitats: Nutrient enriched tree bark, also on calcareous rock, tombstones, and asbestos-cement.
Online References:
References:
9/18/2009 · Acadia National Park, Bar Harbor, Maine · ≈ 2 × 1′ (58 × 38 cm) 
ID is uncertain 
4/3/2010 · Owl’s Head Lighthouse, Owl’s Head, Maine · ≈ 14 × 10″ (36 × 24 cm) ID is uncertain 
| Kingdom | Fungi | Mushrooms, lichens, gel fungi, yeasts, and molds; also called eukaryotes |
| Division | Ascomycota | Sac fungi |
| Subdivision | Pezizomycotina | Sac fungi with filaments |
| Class | Lecanoromycetes | “Lichenized” fungi |
| Order | Lecanorales | Mostly lichen-forming fungi |
| Suborder | Lecanorineae | Lichens |
| Family | Physciaceae | A family of mostly lichen-forming fungi, the name chosen for its type genus, Physcia |
| Genus | Physcia | |
| Species | adscendens |
Physcia adscendens description by Thomas H. Kent, not updated.
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