Observation 50139: Arctoparmelia centrifuga (L.) Hale

Identification: There are 4 species of Arctoparmelia in North America (Bruce Ryan notes):
incurva (sorediate; “underside dark brown at edges (blackening centrally)”)
subcentrifuga (sorediate; “underside black”)
centrifuga (esorediate; “underside dirty whitish or pale brownish”)
separata (esorediate; “underside mouse gray or dove gray to blue-black”; high arctic)
Three of these are recorded from Jasper NP, according to online CNALH records: incurva and centrifuga on the Jonas rock slide (collected by Elizabeth John and Ernie Brodo, resp.), and subcentrifuga on the trail to Consolation Lake NE of Maligne Lake (collected by Bruce Ryan). The lichens in the present photos are esorediate and have a creamy white underside, so I take them to represent Arctoparmelia centrifuga.


John, Elizabeth A., 1989, The Saxicolous Lichen Flora of Jonas Rockslide, Jasper National Park, Alberta, The Bryologist, Vol. 92, No. 1 (Spring, 1989), pp. 105-111

Common name: concentric ring lichen

[admin – Sat Aug 14 02:02:35 +0000 2010]: Changed location name from ‘Maligne River, 3 mi N Maligne Lake, Jasper NP, Alberta, Canada’ to ‘Maligne River, 3 mi north of Maligne Lake, Jasper National Park, Alberta, Canada’

Species Lists


with apothecia

Proposed Names

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Used references: Bruce Ryan notes

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this seems to be the most common species
By: Jason Hollinger (jason)
2010-08-11 10:59:31 MST (-0700)

I’ve been looking for the others for a long time with no luck.

Created: 2010-08-11 10:33:24 MST (-0700)
Last modified: 2010-09-11 15:51:36 MST (-0700)
Viewed: 145 times, last viewed: 2018-11-17 12:33:09 MST (-0700)
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