<  Usnea diplotypus
Usnea fragilescens  >
Click on Characteristic name for explanation. Click on image for larger version.
Usnea flavocardia

PNW Range:
  West sideOccasional
  East sideUncommon
  Immediate coastOccasional
  Alpine or subalpineNone
Habitat: Oceanic to suboceanic forests, woodlands, and savannas.
Substrate: On bark and wood.
Synonymy: Usnea wirthii
Usnea flavocardia - Red spots
Red spots
by B. McCune
Usnea flavocardia - Branches
by B. McCune
Usnea flavocardia - Soralia
by B. McCune
Usnea flavocardia - Habit
by B. McCune
Usnea flavocardia - Branches
by B. McCune
Scale: Bar=1mm unless noted
Growth Form
Fruticose: Almost always
Foliose: Never
Crustose: Never
Appressed Foliose: Never
Fluffy Foliose or Strappy: Never
Dangling Hair: Sometimes
Erect Hair: Commonly
Appressed Hair: Never
Stalks With Squamules: Never
Stalks: Never
Squamules: Never
Single Holdfast: Almost always
Dangling Nets: Never

Upper Surface
Upper Surface Color    (Dry) 
   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: Never
Upper Surface with Pseudocyphellae: Never
   Upper Surface with Holes into Cavity: Never
Cilia on Margins: Never

Inside (Medulla) Yellow or Orange: Never
Central Cord: Almost always
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 KC+ Yellow: Almost always
Medulla P+ Yellow: Sometimes
Sexual Reproduction
Perithecia: Never
Apothecia: Rarely
   Mazaedium: Never
Disk Color    (Dry) 
   Disk Pale Greenish: Almost always
   Disk Brown or Tan: Almost always

Asexual Reproduction
Isidia: Rarely
Soredia: Commonly
Lobules: Never

Usnea Specific
Papillae: Almost always
Branches Cigar Shaped: Never
Central Axis Pale Yellow: Almost always
Cortex Reddish in Part: Sometimes
Central Axis Thick: Never
Main Branches Nearly Unbranched: Never
Branch Surface Wrinkled: Never
Fibrils Abundant: Commonly