The Hypogymnia Species of North America

Hypogymnia imshaugii

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

Overview

Synopsis: White lobe interiors, erect or suberect imperforate lobes (appressed in some forms), similar in habit to H. inactiva, P+ orange-red or P-.
Distribution: North American endemic; BC to Mexico, inland to Wyoming
Habitat: semi arid forest and savanna to oceanic forest
Range: Northern Rocky Mountains, Pacific Northwest, Central and Southern California, Pacific Northwest Immediate Coast
Abundance in North America: Common
Substrate: Typically
Host: Conifers and hardwoods, both bark and wood
On Rock: Never
On Moss/Detritus/Sod: Never
Authority: Krog
References: Krog (1968), McCune et al. (2011)
Synonymy: None
Hypogymnia imshaugii - Habit
Habit

Vegetative Structures

Habit Appressed: Sometimes
Habit Pendulous: Never
Habit Erect to Suberect: Almost always
Size (cm): Mean: 8 SD: 4
Upper Color- White to Greenish Gray: White to greenish gray or brown
Upper Surface Brown when Solarized: Blackish or unknown
Dark Mottles: Sometimes present
Black Border: Sometimes present
Lobes Separated: Separate to centrally contiguous
Lobe Outline: Even
Upper Surface Texture: Smooth to rugose
Branching: Isotomic dichot to irreg
Budding: Absent or rare
Lobe Width (mm): Mean: 1.15 SD: 0.425
Lobe Tips, Axils, and/or Lower Surface Perforated: Rarely
Lobe Tips Perforated: Rarely perforate
Lower Surface Perforated: Rarely perforate
Cavernulae: Never
Thallus Texture: Cartilaginous
Medulla: Almost always
Ceiling Color: White
Floor Color: White
Hypogymnia imshaugii - Habit
Habit
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Habit
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Habit
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Habit
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Habit
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Habit
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Habit
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Hypogymnia imshaugii - Lobe cavity
Lobe cavity
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Habit
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Hypogymnia imshaugii - Lobe cavity
Lobe cavity
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Habit
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Hypogymnia imshaugii - Lower surface
Lower surface
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Habit
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Reproductive Structures

Soredia: None
Schizidia: Rarely
Isidia: None
Lobules: None
Apothecia: Common
Spore Length (µm): Mean: 7.15 SD: 0.425 Max: 8 Min: 6.3
Spore Width (µm): Mean: 4.5 SD: 0.35 Max: 5.2 Min: 3.8
Pycnidia: Common
Hypogymnia imshaugii - Hymenium, polarized light
Hymenium, polarized light
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Hypogymnia imshaugii - Hymenium
Hymenium
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Hypogymnia imshaugii - Spermatia
Spermatia
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Hypogymnia imshaugii - Ascospores
Ascospores
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Chemistry