The Hypogymnia Species of North America

Hypogymnia inactiva

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


Synopsis: Erect to drooping lobes, similar to H. imshaugii but with dark lobe interiors and occasional perforations in the lobe tips and axils; medulla K-, KC+ orange red, P-.
Distribution: North American endemic; Alaska to California inland to Montana
Habitat: moist to wet temperate forests
Range: Northern Rocky Mountains, Pacific Northwest, Pacific Northwest Immediate Coast
Abundance in North America: Locally common
Substrate: Typically
Host: Hardwoods, conifers, bark and wood
On Rock: Never
On Moss/Detritus/Sod: Never
Authority: (Krog) Ohlsson
References: Krog (1968), Ohlsson (1973), McCune et al. (2011)
Synonymy: Hypogymnia imshaugii var. inactiva
Hypogymnia inactiva - Habit

Vegetative Structures

Habit Appressed: Sometimes
Habit Pendulous: Sometimes
Habit Erect to Suberect: Almost always
Size (cm): Mean: 12 SD: 6
Upper Color- White to Greenish Gray: White to greenish gray
Upper Surface Brown when Solarized: Blackish or unknown
Dark Mottles: Often present
Black Border: Sometimes present
Lobes Separated: Separate
Lobe Outline: Even
Upper Surface Texture: Smooth
Branching: Isotomic dichot.
Budding: Absent or rare
Lobe Width (mm): Mean: 1.75 SD: 0.625
Lobe Tips, Axils, and/or Lower Surface Perforated: Sometimes
Lobe Tips Perforated: Sometimes perforate
Lower Surface Perforated: Sparsely perforate
Cavernulae: Never
Thallus Texture: Cartilaginous
Medulla: Almost always
Ceiling Color: Dark
Floor Color: Dark
Hypogymnia inactiva - Perforate lobe tips
Perforate lobe tips
Hypogymnia inactiva - Upper surface solarized
Upper surface solarized
Hypogymnia inactiva - Lobe cavity
Lobe cavity
Hypogymnia inactiva - Habit
Hypogymnia inactiva - Perforate branch axil
Perforate branch axil

Reproductive Structures

Soredia: None
Schizidia: Rarely
Isidia: None
Lobules: None
Apothecia: Common
Spore Length (µm): Mean: 7.25 SD: 0.375 Max: 8 Min: 6.5
Spore Width (µm): Mean: 4.75 SD: 0.125 Max: 5 Min: 4.5
Pycnidia: Common
Hypogymnia inactiva - Ascospores