Peltigera aphthosa - Common Macrolichens of the Pacific Northwest

< Parmotrema perlatum

Peltigera britannica >

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Peltigera aphthosa

Overview
PNW Range:
West side	Uncommon
East side	Common
Immediate coast	Uncommon
Alpine or subalpine	Common
Habitat:	Common in more continental climates east Cascades but largely replaced by P. britannica in low to mid-elevation moist forests west Cascades; frequent on roadcuts and in open outcrop and talus areas.
Substrate:	Soil, forest floor, and mossy rocks.
Comments:
Synonymy:	none

Peltigera aphthosa - Habit

Habit

Growth Form
Fruticose:	Never
Foliose:	Almost always
Crustose:	Never
Appressed Foliose:	Sometimes
Fluffy Foliose or Strappy:	Sometimes
Dangling Hair:	Never
Erect Hair:	Never
Appressed Hair:	Never
Stalks With Squamules:	Never
Stalks:	Never
Squamules:	Never
Single Holdfast:	Never
Dangling Nets:	Never
Lobe Width (mm):	30 (± 10)

Upper Surface
Upper Surface Color (Dry)
Pale Gray Green:	Almost always
Pale Green:	Almost always
Dark Green:	Almost always
Olive Brown:	Commonly
Olive Green:	Almost always
Brown:	Sometimes
Tan:	Sometimes
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

Lower Surface (Foliose)
Lower Surface Color (Dry)
Whitish:	Commonly
Pale Gray:	Commonly
Dark Gray:	Commonly
Black:	Commonly
Brown:	Sometimes
Tan:	Sometimes
Veined Below:	Sometimes
Rhizinate Below:	Almost always
Rhizines Squarrose:	Sometimes
Tomentose Below:	Sometimes
Cyphellae:	Never
Pseudocyphellae Below:	Never
Papillae Below:	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:	Almost always

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

Asexual Reproduction
Isidia:	Never
Soredia:	Never
Lobules:	Never