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Rhizocarpon intermediellum Rasanen
Family: Rhizocarpaceae
Rhizocarpon intermediellum image
André Aptroot  
Life habit: lichenized (mutualistic with algal photobionts) | lichenicolous (in/on lichens) thallus: crustose (crustaceous) – episubstratal – unspecified thallus: compartimentized – areolate, squamulate [th] upper surface: yellow(ish) (if dull: buff) [th marginal and upper surface] specific structures: absent [th] morphol substructures (eg areoles, lobes, branches) width [mm]: (low) 0.1 (high) 0.5 (max) 0.7 [th] morphol substructures (eg areoles, squamules): contiguous, coherent (throughout the thallus) | discontiguous, dispersed (throughout the thallus) [th] morphol substructures (eg areoles, lobes, branches) upper surface: smooth, plane ascomata: absent | present ascoma: apothecial, apothecioid – hymenial ascoma [mm]: (min) 0.5 [ascm, if apoth] disc, mazaedium: 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] margin excipular photobionts: absent [ascm, if apoth] subhymenial layers, hypothecium; [if perith] basal excipulum: brown(ish) (if pale: fawn, tan; if mid: cinnamon) [ascm] paraphyses/-oids: present [ascm] epihymenium, epithecium: brown(ish) (if pale: fawn, tan; if mid: cinnamon) 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: ellipsoidal [asp] length [µm]: (low) 12.0 (high) 21.0 [asp] width [µm]: (low) 6.0 (high) 10.0 [asp] septa: present [asp] septa: transversely septate | muriformly septate – muriform, submuriform [asp] transversal septa: (min) 1.0(median) 3.0 (max) 4.0 [asp] pigmentation: greenish brown [asp] perispore, epispore: thick, distincly halonate secondary metabolites: present secondary metabolites: psoromic acid | rhizocarpic acid primary photobiont: present secondary photobionts (eg in cephalodia): absent primary photobiont: chlorophytaceous – trebouxiaceous, chlorococcoid.

substrate: lichens, lichenized fungi | rock – siliceous, siliciferous, acidic.