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Ochrolechia pallescens (L.) Körb. (redirected from: Parmelia pallescens f. subalpina)
Family: Parmeliaceae
[Gasparrinia pallescens (L.) Tornab.,  more]
Ochrolechia pallescens image

Global occurrence: Africa (incl Madagascar) | Eurasia – Asia Extratropical | Oceania – Australasia | Eurasia – Europe | Americas – South and Central America | Eurasia – Asia Tropical | Arctic.  Substrate: bark, cork, plant surface – trunks, branches, twigs.  Life habit: lichenized (mutualistic with algal photobionts).  Thallus: crustose (crustaceous) – episubstratal – unspecified; continuous, diffuse, effuse; [th] upper surface: grey(ish) | white(ish); [th marginal and upper surface] specific structures: absent; [th] morphol substructures (eg areoles, squamules): contiguous, coherent (throughout the thallus); [th] morphol substructures (eg areoles, lobes, branches) upper surface: verrucose, warted.  Ascomata: absent | present; ascoma: apothecial, apothecioid – hymenial; ascoma [mm]: (low) 3.0 (high) 4.0; ascoma: sessile, superficial; [ascm, if apoth] disc, mazaedium: concave | plane, flat, flattened, expanded; [ascm, if apoth] disc, mazaedium: brown(ish) (if pale: fawn, tan; if mid: cinnamon) | yellow(ish) red (orange red); [ascm, if apoth] disc, mazaedium: epruinose | pruinose; [ascm, if apoth] margin surface; [if perith] periostiolar area, ostiole, involucrellum: grey(ish) | white(ish); [ascm, if apoth] margin excipular photobionts: present; [ascm, if apoth] subhymenial layers, hypothecium; [if perith] basal excipulum: hyaline, colourless; [ascm] paraphyses/-oids: present; [ascm] epihymenium, epithecium: brown(ish) (if pale: fawn, tan; if mid: cinnamon) | hyaline, colourless.  Asci: lecanoralean; [asc] tholus: thickened; [asc] tholus amyloidity (iodine reaction): present; [asc] tholus amyloidity pattern: with amyloid cap (= Icmadophila-, Lecidea-, Pertusaria-types etc).  Ascospores: [asp] shape: ellipsoidal; [asp] length [µm]: (low) 40.0 (high) 70.0; [asp] width [µm]: (low) 25.0 (high) 30.0; [asp] septa: absent – spore lumen unilocular, monolocular; [asp] pigmentation: hyaline, colourless; [asp] perispore, epispore: not apparent.  Secondary metabolites: present, gyrophoric acid | variolaric acid.  Primary photobiont: present, chlorophytaceous – trebouxiaceous, chlorococcoid.  Secondary photobionts (eg in cephalodia): absent.