Slideshow image
Physconia distorta (With.) J. R. Laundon
Family: Physciaceae
[Lichen distortus With.,  more]
Physconia distorta image

Global occurrence: Africa (incl Madagascar) | Eurasia – Asia Extratropical | Oceania – Australasia | Eurasia – Europe | Americas – North America (incl Mexico) | 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: foliose (foliaceous), leaf-like; [th] upper surface: grey(ish) | brown(ish) (if pale: fawn, tan; if mid: cinnamon) | grey(ish) brown; [th upper surface]: pruinose; [th upper surface] pruina: scarce, sparse, fine | dense; [th marginal and upper surface] specific structures: absent; [th] morphol substructures (eg areoles, lobes, branches) width [mm]: (min) 2.0; [th] morphol substructures (eg areoles, squamules): contiguous, coherent (throughout the thallus); [th] lower surface: black(ish); [th lower surface] specific structures: present; [th lower surface] rhizines, rhizoid structures: present; [th lower surface] rhizines, rhizinoid structures: irregularly branched, irregular.  Ascomata: absent | present; ascoma: apothecial, apothecioid – hymenial; ascoma [mm]: (min) 5.0; ascoma: sessile, superficial; [ascm, if apoth] disc, mazaedium: plane, flat, flattened, expanded; [ascm, if apoth] disc, mazaedium: brown(ish) (if pale: fawn, tan; if mid: cinnamon); [ascm, if apoth] disc, mazaedium: epruinose | pruinose; [ascm, if apoth] margin surface; [if perith] periostiolar area, ostiole, involucrellum: brown(ish) (if pale: fawn, tan; if mid: cinnamon) | grey(ish) brown; [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). Asci: lecanoralean; [asc] tholus: thickened; [asc] tholus amyloidity (iodine reaction): present; [asc] tholus amyloidity pattern: amyloid with widening axial body towards the apex (= Lecanora-, Parmelia-, Rinodina-types etc).  Ascospores: (median) 8.0; [asp] length [µm]: (min) 25.0 (low) 27.0 (high) 38.0; [asp] width [µm]: (low) 13.0 (high) 20.0; [asp] septa: present, transversely septate; [asp] transversal septa: (median) 1.0; [asp] pigmentation: medium brown, brownish.  Conidiomata: absent | present.  Secondary metabolites: absent.  Primary photobiont: present, chlorophytaceous – trebouxiaceous, chlorococcoid.  Secondary photobionts (eg in cephalodia): absent.