Arctoparmelia incurva (Pers.) Hale, 1986
| Common name | Powdered Ring Lichen |
|---|---|
| Code | ARCTINC |
| Field Characters | Leafy, yellow chlorolichen. Thalli appressed. Lobes narrow, angular, irregularly branching, typically to 0.2 cm across. Upper cortex dull, pale yellow in younger lobes, darkening in older lobes. Soredia typically abundant, in laminal, globose soralia that resemble small pompoms. Lower cortex white to pale brown with sparse simple rhizines. Apothecia rare. |
| Similar species & genera |
Arctoparmelia subcentrifuga: lower cortex grey to black or purplish black (check towards the centre of the thallus, not at the lobe tips).
Arctoparmelia centrifuga, A. separata: apotheciate, esorediate. Parmeliopsis ambigua: lower cortex brown, soralia not as globose, rarely on rock. If in doubt, TLC can be used to check for divaricatic acid in this species vs. alectoronic in Arctoparmelia. Xanthoparmelia: rhizines commonly branched, lower cortex often black or dark brown (vs. white), cortices often shiny, medulla often PD+ orange to red. |
| Ecology | Saxicolous, typically on granitic rock. Rare in the shield and mountain regions of Alberta. |
| Chemistry | Upper cortex KC+ yellow, K+ yellow, C-, PD- or PD+ pale yellow, UV- (usnic acid, atranorin). Medulla KC+red, K-, C-, PD-, UV+ white (alectoronic acid). AB collections TLCed: 4. |
| Molecular support |
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- Arctoparmelia incurva
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- Arctoparmelia incurva
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- Arctoparmelia incurva
