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Gyalidea diaphana (Körb.) V?zda
Family: Gomphillaceae
[Biatora diaphana Nyl.,  more]
Gyalidea diaphana image

Global occurrence: Eurasia – Europe | Arctic.  Substrate: rock, stones, pebbles – unspecified.  Life habit: lichenized (mutualistic with algal photobionts).  Thallus: crustose (crustaceous) – episubstratal – unspecified, continuous, diffuse, effuse; [th] upper surface: black(ish); [th marginal and upper surface] specific structures: absent.  Ascomata: absent | present; ascoma: apothecial, apothecioid – hymenial; ascoma [mm]: (low) 0.2 (high) 0.4; [ascm, if apoth] disc, mazaedium: plane, flat, flattened, expanded; [ascm, if apoth] disc, mazaedium: brown(ish) black | red(dish) grey; [ascm] paraphyses/-oids: present.  Asci: unitunicate; [asc] tholus: thickened; [asc] tholus amyloidity (iodine reaction): absent.  Ascospores: (min) 4.0(median) 8.0; [asp] shape: ellipsoidal; [asp] length [µm]: (low) 8.0 (high) 12.0 (max) 15.0; [asp] width [µm]: (low) 5.0 (high) 6.0; [asp] septa: present, transversely septate; [asp] transversal septa: (median) 1.0 (max) 3.0; [asp] pigmentation: hyaline, colourless; [asp] perispore, epispore: thick, distincly halonate.  Secondary metabolites: absent.  Primary photobiont: present, chlorophytaceous – trebouxiaceous, chlorococcoid.  Secondary photobionts (eg in cephalodia): absent.