The Hypogymnia Species of North America

Hypogymnia beringiana

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

Overview

Synopsis: Erect, dactylina-like black-mottled lobes with isotomic dichotomous branching, sparsely perforate, lobe cavity with white or dark ceilings and dark floors, on tundra sod or rocks
Distribution: Alaska (Aleutian Islands and islands in the Bering Sea) and Russia. The sole record from Russia, Mattson 3114 (Figs. 5-6), is uncertain. Aleutian Islands: St Paul Island, Nunivak Island (Nash Harbor) (Krog 1968); Port Clarence (Bering Strait) on the Harriman Expedition (Cummings 1904).
Habitat: oceanic tundra
Range: Arctic, Subarctic, Alpine
Other Diagnostics: Erect, Dactylina-like growth form
Substrate Notes: Oceanic tundra, on mosses or detritus, or rock.
Abundance in North America: Rare
Substrate: Never
Host: N.A.
On Rock: Typically
On Moss/Detritus/Sod: Occasional
Authority: Krog
References: McCune (2008)
Synonymy: Hypogymnia lugubris subsp. beringiana
Hypogymnia beringiana - Habit
Habit

Vegetative Structures

Habit Appressed: Rarely
Habit Pendulous: Never
Habit Erect to Suberect: Almost always
Size (cm): Mean: 5 SD: 2.5
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 to centrally subcontiguous
Lobe Outline: Even to nodulose
Upper Surface Texture: Smooth
Branching: Isotomic dichot.
Budding: Absent or rare
Lobe Width (mm): Mean: 1.5 SD: 0.5
Lobe Tips, Axils, and/or Lower Surface Perforated: Sometimes
Lobe Tips Perforated: Sparsely perforate
Lower Surface Perforated: Sparsely perforate
Cavernulae: Never
Thallus Texture: Cartilaginous
Medulla: Almost always
Ceiling Color: White or dark
Floor Color: Dark
Hypogymnia beringiana - Habit
Habit
1/9
Hypogymnia beringiana - Upper surface
Upper surface
2/9
Hypogymnia beringiana - Lower surface
Lower surface
3/9
Hypogymnia beringiana - Habit
Habit
4/9
Hypogymnia beringiana - Lobes
Lobes
5/9
Hypogymnia beringiana - Habit
Habit
6/9
Hypogymnia beringiana - Habit
Habit
7/9
Hypogymnia beringiana - Lobe cavity
Lobe cavity
8/9

Reproductive Structures

Soredia: None
Schizidia: Rarely
Isidia: None
Lobules: None
Apothecia: Unknown
Pycnidia: Sparse

Chemistry