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Rhizocarpon eupetraeoides (Nyl.) Blomb. & Forss.  
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Family: Rhizocarpaceae
[Catocarpus chionophiloides (Vain.) Mereschk., moreLecidea atroalbescens Nyl., Lecidea chionophiloides Vain., Lecidea eupetraeoides Nyl., Rhizocarpon atroalbens (Nyl.) Zahlbr., Rhizocarpon atroalbescens (Nyl.) Zahlbr., Rhizocarpon chionophiloides (Vain.) Vain., Rhizocarpon chionophiloides f. atroalbescens (Nyl.) Räsänen, Rhizocarpon chionophiloides f. chionophiloides (Vain.) Vain., Rhizocarpon chionophiloides f. subnegans (Vain.) Vain., Rhizocarpon chionophiloides var. chionophiloides (Vain.) Vain., Rhizocarpon chionophiloides var. subnegans (Vain.) Räsänen]
Rhizocarpon eupetraeoides image
Gary Perlmutter  
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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: black(ish) | yellow(ish) (if dull: buff) [th upper surface]: epruinose [th] morphol substructures (eg areoles, lobes, branches) width [mm]: (min) 1.5 ascomata: absent | present ascoma: apothecial, apothecioid – hymenial ascoma [mm]: (min) 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] 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 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) 18.0 (high) 32.0 [asp] width [µm]: (low) 10.0 (high) 15.0 [asp] septa: absent – spore lumen unilocular, monolocular | present [asp] septa: transversely septate [asp] transversal septa: (median) 1.0 [asp] pigmentation: dark brown [asp] perispore, epispore: thick, distincly halonate secondary metabolites: present secondary metabolites: bourgeanic acid | norstictic acid | rhizocarpic 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 eupetraeoides
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Rhizocarpon eupetraeoides image
Samuel Brinker  
Rhizocarpon eupetraeoides image
Rhizocarpon eupetraeoides image
Rhizocarpon eupetraeoides image
Rhizocarpon eupetraeoides image
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This project made possible by National Science Foundation Awards: #1115116