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Arthonia fuscopurpurea (Tul.) R. Sant.
Family: Arthoniaceae
[Arthonia pelvetii (Hepp) H. Olivier,  more]
Arthonia fuscopurpurea image

Global occurrence: Antarctic – Antarctica | Eurasia – Europe | Americas – North America (incl Mexico) | Americas – South and Central America | Arctic.  Substrate: lichens, lichenized fungi.  Life habit: lichenicolous (in/on lichens).  Thallus: crustose (crustaceous) – endosubstratal, inconspicuous, immersed; [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: brown(ish) black | red(dish) brown (if pale: orange brown); [ascm, if apoth] subhymenial layers, hypothecium; [if perith] basal excipulum: yellow(ish) brown | red(dish) brown (if pale: orange brown); [ascm] epihymenium, epithecium: yellow(ish) brown | red(dish) brown (pale: orange brown).  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) 9.0 (high) 15.0; [asp] width [µm]: (low) 3.0 (high) 5.0; [asp] septa: present, transversely septate; [asp] transversal septa: (median) 1.0.  Primary photobiont: absent.