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Rhizocarpon jemtlandicum (Malme) Malme
Family: Rhizocarpaceae
Rhizocarpon jemtlandicum image
Life habit: lichenized (mutualistic with algal photobionts) thallus: crustose (crustaceous) – episubstratal – unspecified thallus: compartimentized – areolate, squamulate [th] upper surface: grey(ish) | brown(ish) (if pale: fawn, tan; if mid: cinnamon) [th marginal and upper surface] specific structures: absent [th] morphol substructures (eg areoles, lobes, branches) upper surface: smooth, plane | bullate ascomata: absent | present ascoma: apothecial, apothecioid – hymenial ascoma [mm]: (low) 1.0 (high) 1.5 ascoma: sessile, superficial [ascm, if apoth] disc, mazaedium: plane, flat, flattened, expanded | subconvex, slightly convex [ascm, if apoth] disc, mazaedium: black(ish) [ascm, if apoth] margin surface; [if perith] periostiolar area, ostiole, involucrellum: black(ish) [ascm, if apoth] margin excipular photobionts: absent [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: green(ish) | green(ish) brown (olive brown) asci: lecanoralean [asc] tholus: thickened [asc] tholus amyloidity (iodine reaction): present [asc] tholus amyloidity pattern: with amyloid cap (= Icmadophila-, Lecidea-, Pertusaria-types etc) ascospores: (median) 8.0 [asp] shape: broadly ellipsoidal | ellipsoidal [asp] length [µm]: (low) 21.0 (high) 30.0 [asp] width [µm]: (low) 9.0 (high) 15.0 [asp] septa: present [asp] septa: transversely septate [asp] transversal septa: (median) 1.0 [asp] pigmentation: medium brown, brownish | dark brown [asp] perispore, epispore: thick, distincly halonate secondary metabolites: present secondary metabolites: stictic acid primary photobiont: present secondary photobionts (eg in cephalodia): absent primary photobiont: chlorophytaceous – trebouxiaceous, chlorococcoid.

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