Usnea cornuta - Common Macrolichens of the Pacific Northwest

< Usnea cavernosa

Usnea diplotypus >

Click on Characteristic name for explanation. Click on image for larger version.

Usnea cornuta

Overview
PNW Range:
West side	Occasional
East side	None
Immediate coast	Common
Alpine or subalpine	None
Habitat:	Coastal forests, scrub, wetlands, and partly forested lawns.
Substrate:	On both conifers and hardwoods.
Comments:
Synonymy:	none

Usnea cornuta - Habit

Habit
by B. McCune

1/3

Usnea cornuta - Soralia

Soralia
by B. McCune

2/3

Usnea cornuta - Habit

Habit
by B. McCune

3/3

❮ ❯

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:	Sometimes
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

Interior
Inside (Medulla) Yellow or Orange:	Never
Central Cord:	Almost always
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

Chemistry
Usnic Acid:	Almost always
Cortex KC+ Yellow:	Almost always
Medulla P+ Orange or Red:	Commonly
Medulla P+ Yellow:	Rarely
Medulla K+ Orange or Red:	Commonly
Medulla K+ Yellow:	Commonly

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:	Sometimes
Soredia:	Sometimes
Lobules:	Never

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