Arthonia radiata (Pers.) Ach.  
Family: Arthoniaceae
[Arthonia astroidea Ach., moreArthonia astroidea f. astroidea Ach., Arthonia astroidea f. cembrae Arnold, Arthonia astroidea f. fraxinea Bagl., Arthonia astroidea f. parallela Harm., Arthonia astroidea var. astroidea Ach., Arthonia astroidea var. simulans Leight., Arthonia astroidea var. swartziana (Ach.) Sacc., Arthonia cinnabarina var. opegraphina (Ach.) Leight., Arthonia radiata f. astroidea (Ach.) Ach., Arthonia radiata var. opegraphina Ach., Arthonia radiata var. parallela (Harm.) Zahlbr., Arthonia radiata var. radiata (Pers.) Ach., Arthonia radiata var. swartziana (Ach.) Almq., Arthonia swartziana Ach., Arthonia swartziana var. cinerascens Ach., Arthonia swartziana var. swartziana Ach., Arthonia vulgaris var. astroidea (Ach.) Schaer., Graphis atra var. astroidea (Ach.) Spreng., Lichen astroites Ach., Opegrapha astroidea (Ach.) Ach., Opegrapha atra var. astroidea (Ach.) Schaer., Opegrapha atra var. obscura , Opegrapha atra var. swartziana (Ach.) Schaer., Opegrapha gregaria var. radiata (Pers.) M. Choisy, Opegrapha radiata Pers., Opegrapha radiata f. cinerascens (Ach.) M. Choisy, Opegrapha radiata f. radiata Pers., Opegrapha radiata var. astroidea (Ach.) Fingerh., Opegrapha radiata var. cinerascens (Ach.) M. Choisy, Opegrapha radiata var. radiata Pers., Opegrapha radiata var. subparallela (Müll. Arg.) M. Choisy, Opegrapha radiata var. swartziana (Ach.) M. Choisy, Opegrapha swartziana (Ach.) Hepp]
Arthonia radiata image
Stephen Sharnoff
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Botanische Staatssammlung Munchen

Global occurrence: Africa (incl Madagascar) | Oceania – Australasia | Eurasia – Europe | Americas – North America (incl Mexico) | Americas – South and Central America | Arctic.  Substrate: bark, cork, plant surface – trunks, branches, twigs.  Life habit: lichenized (mutualistic with algal photobionts).  Thallus: crustose (crustaceous) – endosubstratal, inconspicuous, immersed | crustose (crustaceous) – episubstratal – unspecified; [th] upper surface: grey(ish) | brown(ish) (if pale: fawn, tan; if mid: cinnamon); [th marginal and upper surface] specific structures: absent.  Ascomata: absent | present; ascoma: apothecial, apothecioid – hymenial; ascoma [mm]: (low) 0.5 (high) 1.5; [ascm, if apoth] disc, mazaedium: concave; [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: hyaline, colourless | brownish hyaline; [ascm] paraphyses/-oids: present; [ascm] epihymenium, epithecium: green(ish) | brown(ish) (if pale: fawn, tan; if mid: cinnamon).  Asci: fissitunicate – bitunicate; [asc] tholus: thickened; [asc] tholus amyloidity (iodine reaction): absent | present; [asc] tholus amyloidity pattern: with amyloid tube, ring (= Collema-, Micarea-, Porpidia-, Psora-types etc).  Ascospores: (median) 8.0; [asp] length [µm]: (low) 15.0 (high) 20.0; [asp] width [µm]: (low) 4.5 (high) 6.0 (max) 7.0; [asp] septa: present, transversely septate; [asp] transversal septa: (median) 3.0 (max) 4.0; [asp] pigmentation: hyaline, colourless; [asp] perispore, epispore: not apparent.  Secondary metabolites: absent.  Primary photobiont: present, chlorophytaceous – trentepohliaceous, trentepohlioid.  Secondary photobionts (eg in cephalodia): absent.

Arthonia radiata
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Arthonia radiata image
Stephen Sharnoff
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Andrew Khitsun
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