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Hypogymnia occidentalis

Overview
PNW Range:
  West sideOccasional
  East sideCommon
  Immediate coastOccasional
  Alpine or subalpineRare
Habitat: Moist low-elevation to subalpine forests; one of the most common Hypogymnia species in Abies grandis, moist Pseudotsuga, and Thuja forests east Cascades and west Rocky Mountains; also common west Cascades but less so than other Hypogymnia species (H. apinnata, H. enteromorpha, and H. inactiva).
Substrate: Bark and wood, usually on conifers, also on hardwoods.
Comments:
Synonymy: none
Hypogymnia occidentalis - Apothecia
Apothecia
by B. McCune
1/17
Hypogymnia occidentalis - Habit
Habit
by B. McCune
2/17
Hypogymnia occidentalis - Perforate lobe tips
Perforate lobe tips
by B. McCune
3/17
Hypogymnia occidentalis - KC+ red spot test
KC+ red spot test
by B. McCune
4/17
Hypogymnia occidentalis - Habit
Habit
by B. McCune
5/17
Hypogymnia occidentalis - Habit
Habit
by B. McCune
6/17
Hypogymnia occidentalis - Upper surface rugose
Upper surface rugose
by B. McCune
7/17
Hypogymnia occidentalis - Habit
Habit
by B. McCune
8/17
Hypogymnia occidentalis - Habit
Habit
by B. McCune
9/17
Hypogymnia occidentalis - Habit
Habit
by B. McCune
10/17
Hypogymnia occidentalis - Budding adventitious branches
Budding adventitious branches
by B. McCune
11/17
Hypogymnia occidentalis - Ascospores
Ascospores
by B. McCune
12/17
Hypogymnia occidentalis - Perforate lobe tips
Perforate lobe tips
by B. McCune
13/17
Hypogymnia occidentalis - Lobes
Lobes
by B. McCune
14/17
Hypogymnia occidentalis - Perforate lobe tips
Perforate lobe tips
by B. McCune
15/17
Hypogymnia occidentalis - Spermatia
Spermatia
by B. McCune
16/17
Hypogymnia occidentalis - Lobe cavity
Lobe cavity
by B. McCune
17/17
Scale: Bar=1mm unless noted
Growth Form
Fruticose: Never
Foliose: Almost always
Crustose: Never
Appressed Foliose: Commonly
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): 3 (± 0.5)

Upper Surface
Upper Surface Color    (Dry) 
   Pale Gray Green: Almost always
   Pale Green: Rarely
   Whitish: Sometimes
   Pale Gray: 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
Lower Surface (Foliose)
Lower Surface Color    (Dry) 
   Black: Almost always
Veined Below: Never
Rhizinate Below: Never
Tomentose Below: Never
Cyphellae: Never
Pseudocyphellae Below: Never
Papillae Below: Never

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

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

Chemistry
Cortex K+ Yellow: Almost always
Medulla KC+ Orange, Red, or Pink: Almost always
Medulla UV+ Blue White: Sometimes
Sexual Reproduction
Perithecia: Never
Apothecia: Commonly
   Mazaedium: Never
Disk Color    (Dry) 
   Disk Brown or Tan: Almost always

Asexual Reproduction
Isidia: Never
Soredia: Never
Lobules: Rarely