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Gyalecta ulmi (Sw.) Zahlbr.
Family: Gyalectaceae
[Caloplaca rubra (Hoffm.) Laronde{?},  more]
Gyalecta ulmi image
 

Global occurrence: Eurasia – Europe | Arctic; substrate:bark, cork, plant surface – trunks, branches, twigs; life habit: lichenized (mutualistic with algal photobionts); 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]: (median) 2.0; [ascm, if apoth] disc, mazaedium: red(dish) | red(dish) brown (if pale: orange brown); [ascm, if apoth] disc, mazaedium: pruinose; [ascm] paraphyses/-oids: present; asci:unitunicate [asc] tholus: thickened; [asc] tholus amyloidity (iodine reaction): absent | present; ascospores: (median) 8.0; [asp] length [µm]: (low) 15.0 (high) 25.0; [asp] width [µm]: (low) 5.0 (high) 8.0; [asp] septa: present; [asp] septa:transversely septate; [asp] transversal septa: (median) 3.0; [asp] pigmentation: hyaline, colourless;[asp] perispore, epispore: not apparent; primary photobiont: present secondary photobionts (eg in cephalodia): absent; primary photobiont: chlorophytaceous – trentepohliaceous, trentepohlioid.