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Data Set Maintenance: Data set standard item. Data set author(s): Thell A. Data set reviewer(s): Thell A.; revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Currently accepted name Flavocetraria cucullata (Bellardi) Kärnefelt & A. Thell. Flavocetraria. Synonyms: Cetraria cucullata (Bellardi) Ach.
Allocetraria cucullata (Bellardi)

Randlane & Saag; Parmeliaceae Zenker (1827); Lecanorales.

Type Information: Basionym: Lichen cucullatus Bellardi. Type: Flavocetraria cucullata (Bellardi) Kärnefelt & A. Thell.

Taxonomic Literature: Bellardi, C. A. L. 1788: Osservazioni botaniche, 63pp. Publ.
Francesco Prato, Torino.
Kärnefelt, I., Thell, A., Randlane, T. & Saag, A. 1994: The genus Flavocetraria Kärnefelt &
Thell (Parmeliaceae, Ascomycotina) and its affinities. Acta Botanica
Fennica 150: 79-86.
Randlane, T. & Saag, A. 1992: New

combinations of some cetrarioid lichens (Parmeliaceae). Mycotaxon
44:
491-493.

Biogeography: Holarctic (mainly holarctic but rare in South America); alpine (occurs at all levels). Continent: Asia-Temperate, Europe, Southern America, and Pacific. Checklist records: Austria, Chile, Estonia, Germany, Germany, Bavaria, Great Britain, Iberic Peninsula, Italy, Sweden and Norway, and United States and Canada (continental).

Thallus: Foliose (erect foliose), subdivided into main parts, and secondary parts, isotomic-dichotomous, continuous throughout, lobed (erect foliose); lobes elongate, horizontal; concave; erect; branches unifacial; not segmented. Secondary Thallus: Trunk with intact wall, yellow, concolorous the branches. Thallus Size and Differentiation: 4-7 cm long; main branches basally constricted; apex curved downwards; rounded. Thallus Outline: Irregular (more or less dichotomously branched). Upper Surface: Yellow, concave, glossy (shiny), smooth; not fissurate; foveate; not convoluted; immaculate; without patches; epruinose; not pseudocyphellate; pseudocyphellae peripheral; not wrinkled; eciliate; without hairs; not isidate; without isidiomorphs; not papillate, not pustulate; not sorediate; not tuberculate; lobulate. Lower Surface: Present, yellow, yellow in the centre, yellow along the margin; attached by holdfasts; pseudocyphellate (small white, plane patches); not cyphellate; not wrinkled; not rhizinate; not tuberculate.

Upper Cortex: 30-60 % of thallus width; double-layered (paraplectenchymatous); epicortex non-porous (i.e., forming a syncortex). Photobiont Layer: Photobiont cells scattered, hyphal cells large, similar in size to medullar hyphae. Medulla: Single-layered, loose; hyphae without particular orientation.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, forming all across the thallus surface, along the margin of the thallus parts, independently from the host thallus or mycelium, sparse, 1-3 mm in diam.. Margin: Smooth, epruinose; not sorediate; not isidiate; without pseudocyphellae pseudocyphellae; not ciliate; not hirsute. Disk: Brown. Epithecium: Apical cells slightly swollen. Hymenium: 30-50 µm high. Interascal Hyphae: Scarcely branched, not or scarcely anastomosed.

Asci: Narrowly clavate; with distinct flanks; ocular chamber present; narrow; dehiscence lecanoralean; dehiscent by rostrum-type dehiscence.

Ascospores: Not uniseriate, c. 8 per ascus, spores 8-8 per ascus, ellipsoid, 5-10 µm long, 3-5.5 µm wide; wall thin, not ornamented.

Conidiomata: Present; stipitate; formed on projections, along the thallus periphery; supporting structure: absent.

Pycnidia: Wall black; single-layered. Conidiogeneous Cells: Intercalar. Conidia: Bifusiform (dumbbell-shaped); 6-6 µm long; 1-1.5 µm wide.

Secondary Metabolites: Present; only in the upper part of the cortex, throughout the cortex, or throughout the thallus medulla, atranorin, lichesterinic acid, protolichesterinic acid, and usnic acid, of the following substance class(es): (higher) aliphatic acids, (anthra-)quinones, and dibenzofurans [and usnic acids], metabolite(s) of unresolved identity: absent.

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