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Cecidonia umbonella (Nyl.) Triebel & Rambold
Family: Lecideaceae
[Lecidea umbonella Nyl.,  more]
Cecidonia umbonella image

Global occurrence: Eurasia – Europe | Americas – North America (incl Mexico) | Arctic.  Substrate: lichens, lichenized fungi.  Life habit: lichenized (mutualistic with algal photobionts) | lichenicolous (in/on lichens).  Thallus: crustose (crustaceous) – episubstratal – unspecified; [th] upper surface: white(ish); [th marginal and upper surface] specific structures: absent.  Ascomata: absent | present; ascoma: apothecial, apothecioid – hymenial; ascoma [mm]: (low) 0.1 (high) 0.6; ascoma: subsessile, subimmersed, adnate, semi-immersed, emergent; [ascm, if apoth] disc, mazaedium: black(ish); [ascm, if apoth] margin surface; [if perith] periostiolar area, ostiole, involucrellum: brown(ish) black; [ascm, if apoth] subhymenial layers, hypothecium; [if perith] basal excipulum: brown(ish) (if pale: fawn, tan; if mid: cinnamon); [ascm] paraphyses/-oids: present; [ascm] epihymenium, epithecium: brown(ish) (if pale: fawn, tan; if mid: cinnamon) | green(ish) brown (olive brown).  Asci: lecanoralean; [asc] tholus: thickened; [asc] tholus amyloidity (iodine reaction): present; [asc] tholus amyloidity pattern: with amyloid cap (= Icmadophila-, Lecidea-, Pertusaria-types etc).  Ascospores: (median) 8.0; [asp] shape: ellipsoidal; [asp] length [µm]: (low) 11.0 (high) 15.0 (max) 16.0; [asp] width [µm]: (min) 6.0 (low) 6.5 (high) 8.0 (max) 10.0; [asp] septa: absent – spore lumen unilocular, monolocular; [asp] pigmentation: hyaline, colourless; [asp] perispore, epispore: not apparent.  Conidiomata: absent | present.  Conidia: bacilliform, bacillary; [co] length [µm]: (low) 5.0 (high) 9.0.  Secondary metabolites: present, norstictic acid.  Primary photobiont: present, chlorophytaceous – trebouxiaceous, chlorococcoid.  Secondary photobionts (eg in cephalodia): absent.