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Celothelium ischnobelum (Nyl.) M.B. Aguirre
Family: Celotheliaceae
[Leptorhaphis carrollii A.L. Sm.,  more]
Celothelium ischnobelum image

Global occurrence: Eurasia – Europe | 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: green(ish) white | 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.  Ascomata: absent | present; ascoma: perithecial, perithecioid – hymenial; ascoma [mm]: (low) 0.45 (high) 1.0; ascoma: immersed, innate | subsessile, subimmersed, adnate, semi-immersed, emergent | sessile, superficial; [ascm] paraphyses/-oids: present.  Asci: fissitunicate – bitunicate; [asc] tholus: thickened; [asc] tholus amyloidity (iodine reaction): absent.  Ascospores: (median) 8.0; [asp] shape: filiform, vermiform; [asp] length [µm]: (low) 80.0 (high) 110.0; [asp] width [µm]: (low) 1.5 (high) 2.5; [asp] septa: present, transversely septate; [asp] transversal septa: (median) 8.0; [asp] pigmentation: hyaline, colourless.  Conidiomata: absent | present.  Conidia: filiform, vermiform; [co] length [µm]: (low) 60.0 (high) 100.0.  Secondary metabolites: absent.  Primary photobiont: present, chlorophytaceous – trentepohliaceous, trentepohlioid.  Secondary photobionts (eg in cephalodia): absent.