The Hypogymnia Species of North America

Hypogymnia canadensis

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

Overview

Synopsis: Smallish imperforate lobes, similar to H. metaphysodes but lobes more imbricate, browner tips, K+ slow reddish brown, KC+ orange red.
Distribution: Alaska to northern Oregon in the coastal states and provinces; North American endemic
Habitat: oceanic to suboceanic forests
Range: Arctic, Subarctic, Alpine, Pacific Northwest
Other Diagnostics: Appears like a rather loosely appressed H. metaphysodes but with imbricate to somewhat separate lobes that are often browned at the tips. Always contains 3-hydroxyphysodic acid and always has brown to dark brown cavity.
Substrate Notes: On conifers, less often on hardwoods (e.g. Alnus)
Abundance in North America: Present
Substrate: Typically
Host: Abies, Tsuga, Picea
On Rock: Never
On Moss/Detritus/Sod: Never
Authority: Goward & McCune
References: Goward & McCune (2007)
Synonymy: None
Hypogymnia canadensis - Habit
Habit

Vegetative Structures

Habit Appressed: Almost always
Habit Pendulous: Rarely
Habit Erect to Suberect: Rarely
Size (cm): Mean: 6 SD: 3
Upper Color- White to Greenish Gray: White to greenish gray or brown
Upper Surface Brown when Solarized: Dark brown
Dark Mottles: None or rare
Black Border: Sometimes present
Lobes Separated: Contiguous to imbricate or separate
Lobe Outline: Even
Upper Surface Texture: Smooth to weakly rugose
Branching: Variable
Budding: Occasional
Lobe Width (mm): Mean: 1.2 SD: 0.4
Lobe Tips, Axils, and/or Lower Surface Perforated: Never
Lobe Tips Perforated: Entire
Lower Surface Perforated: Entire
Cavernulae: Never
Thallus Texture: Cartilaginous
Medulla: Almost always
Ceiling Color: Brown to dark brown
Floor Color: Brown to dark brown
Hypogymnia canadensis - Habit
Habit
1/6
Hypogymnia canadensis - Habit
Habit
2/6
Hypogymnia canadensis - Habit
Habit
3/6
Hypogymnia canadensis - Habit
Habit
4/6
Hypogymnia canadensis - Habit
Habit
5/6

Reproductive Structures

Soredia: None
Schizidia: Rarely
Isidia: None
Lobules: None
Apothecia: Common
Spore Length (µm): Mean: 6 SD: 0.75 Max: 7.5 Min: 4.5
Spore Width (µm): Mean: 5.1 SD: 0.2 Max: 5.5 Min: 4.7
Pycnidia: Common
Hypogymnia canadensis - Apothecia pedicels
Apothecia pedicels
1/5
Hypogymnia canadensis - Ascospores
Ascospores
2/5
Hypogymnia canadensis - Spermatia
Spermatia
3/5
Hypogymnia canadensis - Apothecia pedicels
Apothecia pedicels
4/5
Hypogymnia canadensis - Hymenium
Hymenium
5/5

Chemistry