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Lithographa tesserata (DC.) Nyl.
Family: Xylographaceae
[Haplographa tesserata (DC.) M. Choisy,  more]
Lithographa tesserata image
Stephen Sharnoff  
Life habit: lichenized (mutualistic with algal photobionts) thallus: crustose (crustaceous) – episubstratal – unspecified thallus: compartimentized – areolate, squamulate [th] upper surface: white(ish) | brown(ish) grey | white(ish) grey | grey(ish) white [th marginal and upper surface] specific structures: absent [th] morphol substructures (eg areoles, lobes, branches) width [mm]: (low) 0.4 (high) 0.8 (max) 1.2 [th] medulla amyloidity: absent ascomata: absent | present ascoma: apothecial, apothecioid – hymenial ascoma [mm]: (low) 0.3 (high) 0.4 ascoma: sessile, superficial [ascm, if apoth] disc, mazaedium: strongly concave, excavate, urceolate | concave | plane, flat, flattened, expanded [ascm, if apoth] disc, mazaedium: black(ish) [ascm, if apoth] disc, mazaedium: epruinose [ascm, if apoth] margin surface; [if perith] periostiolar area, ostiole, involucrellum: black(ish) [ascm, if apoth] subhymenial layers, hypothecium; [if perith] basal excipulum: brown(ish) (if pale: fawn, tan; if mid: cinnamon) | black(ish) brown [ascm] paraphyses/-oids: present [ascm] epihymenium, epithecium: hyaline, colourless asci: lecanoralean [asc] tholus: thickened [asc] tholus amyloidity (iodine reaction): present [asc] tholus amyloidity pattern: with amyloid tube and flanks (= Rimularia-, Trapelia-types etc) ascospores: (median) 8.0 [asp] shape: ellipsoidal [asp] length [µm]: (low) 9.0 (high) 12.0 (max) 15.0 [asp] width [µm]: (low) 5.0 (high) 8.0 [asp] septa: absent – spore lumen unilocular, monolocular [asp] pigmentation: hyaline, colourless [asp] perispore, epispore: not apparent secondary metabolites: present secondary metabolites: norstictic acid primary photobiont: present secondary photobionts (eg in cephalodia): absent primary photobiont: chlorophytaceous – trebouxiaceous, chlorococcoid.

substrate: rock – siliceous, siliciferous, acidic | rock, stones, pebbles – unspecified.