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North American Lichen Herbaria
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Rhizocarpon superficiale (Schaer.) Vain.  
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Family: Rhizocarpaceae
Rhizocarpon superficiale image
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Botanische Staatssammlung München
Life habit: lichenized (mutualistic with algal photobionts) thallus: crustose (crustaceous) – episubstratal – unspecified thallus: compartimentized – areolate, squamulate [th] upper surface: yellow(ish) (if dull: buff) | yellow(ish) green [th marginal and upper surface] specific structures: absent ascomata: absent | present ascoma: apothecial, apothecioid – hymenial ascoma [mm]: (median) 2.0 ascoma: sessile, superficial [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: blue(ish) black | brown(ish) black | 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: ellipsoidal [asp] length [µm]: (low) 11.0 (high) 18.0 [asp] width [µm]: (low) 6.0 (high) 8.0 [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: norstictic acid | rhizocarpic acid | 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.
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Rhizocarpon superficiale
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Rhizocarpon superficiale image
André Aptroot  
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This project made possible by National Science Foundation Awards: #1115116