Slideshow image
Opegrapha rupestris Pers.
Family: Opegraphaceae
[Graphis saxatilis (DC.) Wallr.,  more]
Opegrapha rupestris image
Life habit: lichenized (mutualistic with algal photobionts) | lichenicolous (in/on lichens) thallus: crustose (crustaceous) – endosubstratal, inconspicuous, immersed | crustose (crustaceous) – episubstratal – unspecified thallus: continuous, diffuse, effuse [th] upper surface: grey(ish) | green(ish) | brown(ish) yellow (ochraceous, ochre) | brown(ish) red (carneous) | yellow(ish) white (ivory, off-white, cream-coloured) [th marginal and upper surface] specific structures: absent [th] morphol substructures (eg areoles, lobes, branches) upper surface: smooth, plane | cracked, fissured, fractured, rimulose, subrimose ascomata: absent | present ascoma: apothecial, apothecioid – hymenial ascoma [mm]: (low) 0.16 (high) 0.25 (max) 0.35 ascoma: subsessile, subimmersed, adnate, semi-immersed, emergent | sessile, superficial [ascm, if apoth] disc, mazaedium: black(ish) [ascm, if apoth] margin surface; [if perith] periostiolar area, ostiole, involucrellum: brown(ish) (if pale: fawn, tan; if mid: cinnamon) | brown(ish) black | black(ish) brown [ascm, if apoth] margin excipular photobionts: absent [ascm] paraphyses/-oids: present [ascm] epihymenium, epithecium: brown(ish) (if pale: fawn, tan; if mid: cinnamon) asci: fissitunicate – bitunicate [asc] tholus: thickened [asc] tholus amyloidity (iodine reaction): present [asc] tholus amyloidity pattern: with amyloid tube, ring (= Collema-, Micarea-, Porpidia-, Psora-types etc) ascospores: (median) 8.0 [asp] shape: subglobose, subspherical | broadly ellipsoidal | ellipsoidal | oval | elongate-fusiform, ellipsoidal-fusiform | clavate [asp] length [µm]: (min) 13.0 (low) 16.0 (high) 26.0 (max) 31.0 [asp] width [µm]: (low) 4.0 (high) 6.5 (max) 8.0 [asp] septa: present [asp] septa: transversely septate [asp] transversal septa: (median) 3.0 [asp] pigmentation: hyaline, colourless | pale brown | medium brown, brownish | dark brown [asp] perispore, epispore: not apparent | ornamented, rough, warted, striate, cracked conidiomata: absent | present conidia: ellipsoidal | bacilliform, bacillar [co] length [µm]: (low) 3.5 (high) 5.0 (max) 7.0 secondary metabolites: absent primary photobiont: present secondary photobionts (eg in cephalodia): absent primary photobiont: chlorophytaceous – trentepohliaceous, trentepohlioid.

substrate: lichens, lichenized fungi | rock – siliceous, siliciferous, acidic | rock – calcareous, calciferous, basic | rock, stones, pebbles – unspecified.