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Letharia columbiana

Overview
PNW Range:
  West sideRare
  East sideCommon
  Immediate coastNone
  Alpine or subalpineCommon
Habitat: Common in subalpine forests, high plateaus and ridges to timberline, occasional in low elevation forests.
Substrate: Bark or wood, rarely rock.
Comments:
Synonymy: none
Letharia columbiana - Branches
Branches
by B. McCune
1/5
Letharia columbiana - Apothecia
Apothecia
by B. McCune
2/5
Letharia columbiana - Habit
Habit
by B. McCune
3/5
Letharia columbiana - Habit
Habit
by B. McCune
4/5
Letharia columbiana - Branches
Branches
by B. McCune
5/5
Scale: Bar=1mm unless noted
Growth Form
Fruticose: Almost always
Foliose: Never
Crustose: Never
Appressed Foliose: Never
Fluffy Foliose or Strappy: Never
Dangling Hair: Never
Erect Hair: Almost always
Appressed Hair: Never
Stalks With Squamules: Never
Stalks: Never
Squamules: Never
Single Holdfast: Almost always
Dangling Nets: Never

Upper Surface
Upper Surface Color    (Dry) 
   Fluorescent Yellow Green: Almost always
   Yellow: Sometimes
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

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

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

Sexual Reproduction
Perithecia: Never
Apothecia: Commonly
   Mazaedium: Never
Disk Color    (Dry) 
   Disk Brown or Tan: Almost always

Asexual Reproduction
Isidia: Never
Soredia: Never
Lobules: Never