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Platismatia lacunosa (Ach.) Culb. & C. Culb.
Family: Parmeliaceae
[Cetraria lacunosa Ach.,  more]
Platismatia lacunosa image
Stephen Sharnoff  

Global occurrence: Americas – North America (incl Mexico) | Arctic.  Substrate: bryophytes – mosses, liverworts | wood – dead, living | bark, cork, plant surface – trunks, branches, twigs | rock, stones, pebbles – unspecified.  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) | white(ish); [th upper surface]: epruinose; [th marginal and upper surface] specific structures: absent; [th] morphol substructures (eg areoles, lobes, branches) width [mm]: (low) 5.0 (high) 10.0 (max) 15.0; [th] morphol substructures (eg areoles, squamules): distantly discontiguous; [th] morphol substructures (eg areoles, lobes, branches) upper surface: smooth, plane | rugose, plicate, folded, pustulate, faveolate, wrinkled; [th] morphol substructures (eg lobes, branches): irregular; [th] lower surface: black(ish) | brown(ish) (if pale: fawn, tan; if mid: cinnamon); [th lower surface] specific structures: present; [th lower surface] rhizines, rhizoid structures: present; [th lower surface] rhizines, rhizinoid structures: unbranched, simple.  Ascomata: absent | present; ascoma: apothecial, apothecioid – hymenial; ascoma [mm]: (low) 4.0 (high) 20.0; 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); [ascm, if apoth] disc, mazaedium: epruinose; [ascm, if apoth] margin surface; [if perith] periostiolar area, ostiole, involucrellum: grey(ish) | brown(ish) (if pale: fawn, tan; if mid: cinnamon) | white(ish); [ascm, if apoth] margin excipular photobionts: present | abundant; [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) | yellow(ish) brown.  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] shape: ellipsoidal | ovoid, ovate; [asp] length [µm]: (low) 7.0 (high) 10.0; [asp] width [µm]: (low) 3.0 (high) 4.5; [asp] septa: absent – spore lumen unilocular, monolocular; [asp] pigmentation: hyaline, colourless; [asp] perispore, epispore: not apparent.  Conidiomata: absent | present.  Conidia: bacilliform, bacillary; [co] length [µm]: (low) 4.0 (high) 7.0.  Secondary metabolites: present; atranorin | caperatic acid | chloroatranorin | fumarprotocetraric acid.  Primary photobiont: present, chlorophytaceous – trebouxiaceous, chlorococcoid.  Secondary photobionts (eg in cephalodia): absent.

Platismatia lacunosa image
Stephen Sharnoff  
Platismatia lacunosa image
Stephen Sharnoff  
Platismatia lacunosa image
Stephen Sharnoff  
Platismatia lacunosa image
Stephen Sharnoff  
Platismatia lacunosa image
Stephen Sharnoff  
Platismatia lacunosa image
Stephen Sharnoff  
Platismatia lacunosa image
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