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Rhizocarpon hochstetteri (Körb.) Vain.  
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Family: Rhizocarpaceae
[Biatora hochstetteri (Körb.) G. Merr., moreBuellia atroalba (Ach.) Th. Fr., Buellia colludens (Nyl.) Arnold, Buellia colludens var. colludens (Nyl.) Arnold, Buellia colludens var. triseptata M. Knowles ex Ch. Porter, Buellia hochstetteri (Körb.) Mong., Catillaria colludens (Nyl.) Jatta, Catillaria hochstetteri Körb., Catocarpus hochstetteri (Körb.) Oxner, Lecidea colludens Nyl., Lecidea hochstetteri (Körb.) Vain., Lecidea hochstetteri f. hochstetteri (Körb.) Vain., Lecidea hochstetteri f. incrassata Vain., Rhizocarpon colludens (Nyl.) Fryday, Rhizocarpon colludens var. colludens (Nyl.) Fryday, Rhizocarpon colludens var. rufoatrum , Rhizocarpon massalongoi f. colludens (Nyl.) Zahlbr.]
Rhizocarpon hochstetteri image
Stephen Sharnoff  
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Botanische Staatssammlung München
Life habit: lichenized (mutualistic with algal photobionts) thallus: crustose (crustaceous) – episubstratal – unspecified thallus: cracked, fissured, fractured, rimose | compartimentized – areolate, squamulate [th] upper surface: grey(ish) brown | red(dish) brown (if pale: orange brown) [th upper surface]: epruinose [th marginal and upper surface] specific structures: absent [th] morphol substructures (eg areoles, lobes, branches) width [mm]: (low) 0.2 (high) 1.0 [th] morphol substructures (eg areoles, lobes, branches) upper surface: smooth, plane [th] medulla amyloidity: absent ascomata: absent | present ascoma: apothecial, apothecioid – hymenial ascoma [mm]: (low) 0.6 (high) 1.0 (max) 1.2 ascoma: subsessile, subimmersed, adnate, semi-immersed, emergent | sessile, superficial [ascm, if apoth] disc, mazaedium: plane, flat, flattened, expanded | subconvex, slightly convex [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) | black(ish) brown [ascm] paraphyses/-oids: present [ascm] paraphyses/-oid cells width [µm]: (low) 2.5 (high) 3.0 [ascm] paraphyses/-oid apical cells width [µm]: (min) 3.5 [ascm] epihymenium, epithecium: green(ish) | brown(ish) (if pale: fawn, tan; if mid: cinnamon) | green(ish) black | yellow(ish) black 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) 25.0 (max) 28.0 [asp] width [µm]: (low) 8.5 (high) 10.0 (max) 12.0 [asp] septa: present [asp] septa: transversely septate [asp] transversal septa: (median) 1.0 [asp] pigmentation: hyaline, colourless | medium brown, brownish [asp] perispore, epispore: thick, distincly halonate secondary metabolites: absent | 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.
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Rhizocarpon hochstetteri
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This project made possible by National Science Foundation Awards: #1115116