Arctoparmelia subcentrifuga (Oxner) Hale, 1986
| Common name | Dissolving Ring Lichen |
|---|---|
| Code | ARCTSUB |
| Field Characters | Leafy, yellow chlorolichen. Thalli appressed. Lobes narrow, rounded, irregularly branching, typically to 0.3 cm across. Upper cortex dull, pale yellow in younger lobes, darkening in older lobes. Soredia typically abundant, in irregular, coarse laminal pustules, becoming diffuse. Lower cortex grey to black or purplish black (check towards the centre of the thallus, not at the lobe tips), with sparse simple rhizines. Apothecia not known. |
| Similar species & genera |
Arctoparmelia incurva: lower cortex white to pale brown, soralia more globose, delimited, resembling small pompoms.
Arctoparmelia centrifuga, A. separata: apotheciate, esorediate. Parmeliopsis ambigua: lower cortex brown, soralia discrete, circular, 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 or KC-, K-, C-, PD-, UV+ white or UV- (±alectoronic acid). AB collections TLCed: 3. |
| Molecular support |
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- Arctoparmelia subcentrifuga
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- Arctoparmelia subcentrifuga
