Slideshow image
Arthrorhaphis grisea Th. Fr.
Family: Arthrorhaphidaceae
[Bacidia arenicola (Nyl.) H. Olivier,  more]
Arthrorhaphis grisea image
André Aptroot  

Global occurrence: Oceania – Australasia | Eurasia – Europe | Americas – North America (incl Mexico) | 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) 0.2 (high) 0.5; ascoma: sessile, superficial; [ascm, if apoth] disc, mazaedium: concave | plane, flat, flattened, expanded; [ascm, if apoth] disc, mazaedium: black(ish); [ascm, if apoth] margin surface; [if perith] periostiolar area, ostiole, involucrellum: black(ish); [ascm, if apoth] subhymenial layers, hypothecium; [if perith] basal excipulum: green(ish) | hyaline, colourless; [ascm] paraphyses/-oids: present; [ascm] paraphyses/-oid cells width [µm]: (min) 2.0; [ascm] epihymenium, epithecium: green(ish) | brown(ish) (if pale: fawn, tan; if mid: cinnamon). Asci: fissitunicate – bitunicate; [asc] tholus: not thickened | thickened; [asc] tholus amyloidity (iodine reaction): absent.  Ascospores: (median) 4.0; [asp] shape: cylindrical | fusiform | acicular (needle-shaped); [asp] length [µm]: (min) 45.0 (low) 50.0 (high) 65.0 (max) 75.0; [asp] width [µm]: (min) 2.5 (low) 3.0 (high) 5.0 (max) 7.0; [asp] septa: present, transversely septate; [asp] transversal septa: (min) 5.0 (low) 6.0 (high) 11.0 (max) 13.0; [asp] pigmentation: hyaline, colourless; [asp] perispore, epispore: not apparent.  Secondary metabolites: absent.  Primary photobiont: absent.