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Thelidium papulare (Fr.) Arnold
Family: Verrucariaceae
[Verrucaria sprucei Bab.]
Thelidium papulare 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 [th] upper surface: grey(ish) | yellow(ish) (if dull: buff) | brown(ish) (if pale: fawn, tan; if mid: cinnamon) | white(ish) [th marginal and upper surface] specific structures: absent ascomata: absent | present ascoma: perithecial, perithecioid – hymenial ascoma [mm]: (min) 0.3 (low) 0.4 (high) 0.8 (max) 0.88 ascoma: immersed, innate | subsessile, subimmersed, adnate, semi-immersed, emergent [ascm, if apoth] margin surface; [if perith] periostiolar area, ostiole, involucrellum: black(ish) | grey(ish) | brown(ish) (if pale: fawn, tan; if mid: cinnamon) | brown(ish) black [ascm, if apoth] margin excipular photobionts: absent [ascm] paraphyses/-oids: absent asci: fissitunicate – bitunicate [asc] tholus: thickened [asc] tholus amyloidity (iodine reaction): absent [asp] shape: elongate-fusiform, ellipsoidal-fusiform [asp] length [µm]: (min) 27.0 (low) 36.5(median) 42.8 (high) 49.5 (max) 65.0 [asp] width [µm]: (min) 10.5 (low) 14.0(median) 16.4 (high) 18.5 (max) 23.0 [asp] septa: present [asp] septa: transversely septate [asp] transversal septa: (min) 1.0(median) 3.0 (max) 5.0 [asp] pigmentation: hyaline, colourless [asp] perispore, epispore: not apparent secondary metabolites: absent primary photobiont: present secondary photobionts (eg in cephalodia): absent primary photobiont: chlorophytaceous – trebouxiaceous, chlorococcoid.

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