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Diploschistes gypsaceus (Ach.) Zahlbr.
Family: Graphidaceae
[Diploschistes scruposus subsp. gypsaceus (Ach.) Clauzade & Cl. Roux,  more]
Diploschistes gypsaceus image
Samuel Brinker  

Global occurrence: Africa (incl Madagascar) | Eurasia – Asia Extratropical | Oceania – Australasia | Eurasia – Europe | Americas – North America (incl Mexico) | Americas – South and Central America | Arctic.  Substrate: rock – calcareous, calciferous, basic | rock, stones, pebbles – unspecified.  Life habit: lichenized (mutualistic with algal photobionts).  Thallus: crustose (crustaceous) – episubstratal – unspecified; cracked, fissured, fractured, rimose | compartimentized – areolate, squamulate; [th] upper surface: grey(ish) | white(ish); [th upper surface]: pruinose; [th marginal and upper surface] specific structures: absent.  Ascomata: absent | present; ascoma: apothecial, apothecioid – hymenial; ascoma: immersed, innate | subsessile, subimmersed, adnate, semi-immersed, emergent; [ascm] paraphyses/-oids: present.  Asci: unitunicate; [asc] tholus: thickened; [asc] tholus amyloidity (iodine reaction): absent.  Ascospores: (median) 4.0; [asp] shape: broadly ellipsoidal; [asp] length [µm]: (min) 22.0 (low) 30.0 (high) 40.0 (max) 45.0; [asp] width [µm]: (min) 10.0 (low) 15.0 (high) 18.0 (max) 20.0; [asp] septa: present, muriformly septate – muriform, submuriform; [asp] transversal septa: (low) 4.0 (high) 7.0; [asp] pigmentation: medium brown, brownish; [asp] perispore, epispore: not apparent.  Secondary metabolites: present, lecanoric acid.  Primary photobiont: present, chlorophytaceous – trebouxiaceous, chlorococcoid.  Secondary photobionts (eg in cephalodia): absent.