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Umbilicaria rigida (Du Rietz) Frey
Family: Umbilicariaceae
[Actinogyra rigida (Du Rietz) Llano,  more]
Umbilicaria rigida image
Stephen Sharnoff  
Life habit: lichenized (mutualistic with algal photobionts) thallus: peltate, umbilicate thallus: continuous, diffuse, effuse [th] upper surface: grey(ish) | white(ish) | brown(ish) black [th upper surface]: pruinose [th upper surface] pruina: dense [th marginal and upper surface] specific structures: absent | present [th margin] cilia, cilioid structures: absent [th upper surface] isidia, isidioid structures: absent [th upper surface] soredia, soralia, soralioid structures: absent [th] morphol substructures (eg areoles, lobes, branches) width [mm]: (low) 20.0 (high) 50.0 [th] morphol substructures (eg areoles, squamules): distantly discontiguous [th] morphol substructures (eg areoles, lobes, branches) upper surface: verrucose, warted | rugose, plicate, folded, pustulate, faveolate, wrinkled [th] lower surface: grey(ish) | brown(ish) (if pale: fawn, tan; if mid: cinnamon) [th lower surface] specific structures: present [th lower surface] rhizines, rhizoid structures: absent ascomata: absent | present ascoma: apothecial, apothecioid – hymenial ascoma [mm]: (low) 1.0 (high) 2.0 ascoma: subpedicellate, substipitate, subpedunculate, substalked | pedicellate, stipitate, pedunculate, stalked [ascm, if apoth] disc, mazaedium: concave | 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] paraphyses/-oid cells width [µm]: (low) 2.0 (high) 2.5 [ascm] paraphyses/-oid apical cells width [µm]: (low) 2.5 (high) 4.0 [ascm] epihymenium, epithecium: black(ish) | brown(ish) (if pale: fawn, tan; if mid: cinnamon) asci: lecanoralean [asc] tholus: thickened [asc] tholus amyloidity (iodine reaction): present [asc] tholus amyloidity pattern: entirely amyloid (= Catillaria-, Teloschistes-types etc) ascospores: (median) 8.0 [asp] shape: ellipsoidal [asp] length [µm]: (low) 9.5 (high) 14.5 [asp] width [µm]: (low) 2.5 (high) 9.0 [asp] septa: absent – spore lumen unilocular, monolocular [asp] pigmentation: hyaline, colourless [asp] perispore, epispore: not apparent conidiomata: absent | present conidia: cylindrical [co] length [µm]: (low) 3.3 (high) 4.0 secondary metabolites: present secondary metabolites: norstictic acid primary photobiont: present secondary photobionts (eg in cephalodia): absent primary photobiont: chlorophytaceous – trebouxiaceous, chlorococcoid.

substrate: rock – siliceous, siliciferous, acidic.
Umbilicaria rigida image
Lucy Taylor  
Umbilicaria rigida image
Stephen Sharnoff  
Umbilicaria rigida image
Stephen Sharnoff  
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