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Polyblastia cupularis A. Massal.
Family: Verrucariaceae
[Polyblastia fuscoargillacea Anzi,  more]
Polyblastia cupularis image
Life habit: lichenized (mutualistic with algal photobionts) thallus: crustose (crustaceous) – endosubstratal, inconspicuous, immersed | crustose (crustaceous) – episubstratal – unspecified thallus: continuous, diffuse, effuse | cracked, fissured, fractured, rimose | compartimentized – areolate, squamulate [th] upper surface: grey(ish) | white(ish) | grey(ish) brown [th marginal and upper surface] specific structures: absent [th] morphol substructures (eg areoles, lobes, branches) upper surface: smooth, plane ascomata: absent | present ascoma: perithecial, perithecioid – hymenial ascoma [mm]: (min) 0.28 (low) 0.3 (high) 0.54 (max) 0.7 ascoma: subsessile, subimmersed, adnate, semi-immersed, emergent | sessile, superficial [ascm, if apoth] margin surface; [if perith] periostiolar area, ostiole, involucrellum: black(ish) | brown(ish) (if pale: fawn, tan; if mid: cinnamon) [ascm, if apoth] margin excipular photobionts: absent [ascm] paraphyses/-oids: absent asci: fissitunicate – verrucarialean [asc] tholus: thickened [asc] tholus amyloidity (iodine reaction): absent ascospores: (median) 8.0 [asp] shape: broadly ellipsoidal [asp] length [µm]: (low) 20.0 (high) 55.0 [asp] width [µm]: (low) 10.0 (high) 30.0 [asp] septa: present [asp] septa: muriformly septate – muriform, submuriform [asp] pigmentation: hyaline, colourless | pale brown [asp] perispore, epispore: not apparent conidiomata: absent | present conidia: bacilliform, bacillar secondary metabolites: absent primary photobiont: present secondary photobionts (eg in cephalodia): absent primary photobiont: chlorophytaceous – trebouxiaceous, chlorococcoid.

substrate: soil, clay, humus, turf, detritus, dead leaves | rock – calcareous, calciferous, basic | rock, stones, pebbles – unspecified.