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Evernia prunastri

PNW Range:
  West sideAbundant
  East sideOccasional
  Immediate coastCommon
  Alpine or subalpineNone
Habitat: Ubiquitous in most habitats at low elevations west Cascades, especially hardwood forests, savannas, and in urban and agricultural areas; less abundant in lower mountain forests where it is best developed in pockets of hardwoods; east Cascades almost entirely restricted to riparian forests and shrubby areas.
Substrate: Wood or bark, especially hardwood trees and shrubs, occasionally on conifers.
Synonymy: none
Evernia prunastri - Habit
by R. Droker
Evernia prunastri - Habit
by B. McCune
Evernia prunastri - Habit
by R. Droker
Scale: Bar=1mm unless noted
Growth Form
Fruticose: Almost always
Foliose: Almost always
Crustose: Never
Appressed Foliose: Never
Fluffy Foliose or Strappy: Almost always
Dangling Hair: Rarely
Erect Hair: Rarely
Appressed Hair: Never
Stalks With Squamules: Never
Stalks: Never
Squamules: Never
Single Holdfast: Almost always
Dangling Nets: Never
Lobe Width (mm): 5 (± 2)

Upper Surface
Upper Surface Color    (Dry) 
   Pale Gray Green: Almost always
   Pale Yellow Green: Almost always
   Pale Green: Almost always
Upper Surface Tomentose: Never
Upper Surface Pruinose or Scabrid: Never
Upper Surface with Network of Ridges: Sometimes
Upper Surface with Pseudocyphellae: Never
   Upper Surface with Holes into Cavity: Never
Cilia on Margins: Never
Lower Surface (Foliose)
Lower Surface Color    (Dry) 
   Pale Gray Green: Sometimes
   Pale Yellow Green: Sometimes
   Pale Green: Sometimes
   Whitish: Commonly
   Pale Gray: Sometimes
Veined Below: Never
Rhizinate Below: Never
Tomentose Below: Never
Cyphellae: Never
Pseudocyphellae Below: Never
Papillae Below: Never

Inside (Medulla) Yellow or Orange: Never
Central Cord: Never
Hollow Stalks or Hollow Lobes: Never
Gelatinous: Never

Green Algae Primary Photobiont: Almost always
Cyanobacteria Primary Photobiont: Never
Internal Cephalodia: Never
External Cephalodia: Never

Usnic Acid: Almost always
Cortex K+ Yellow: Almost always
Cortex KC+ Yellow: Almost always
Medulla UV+ Blue White: Almost always
Sexual Reproduction
Perithecia: Never
Apothecia: Never
   Mazaedium: Never
Disk Color    (Dry) 
   Disk Brown or Tan: Almost always

Asexual Reproduction
Isidia: Never
Soredia: Almost always
Lobules: Never