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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Scheidegger C. (98-09-01) and Schultz M. (00-03-02); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 2. Harpidium. Lichinaceae Nyl. (1854); Lichinales.

Taxonomic Literature: Hafellner H., Beih. Nova Hedwigia 79: 241-371 [283-285] (1984); Henssen A., Büdel B & Titze A., Botanica Acta 101: 49-55 (1987); Poelt J., Bestimmungsschlüssel Europäischer Flechten: 1-757 [313] (1969); Sancho L.G. & Crespo A., Lazaroa 5: 265-268 (1983); Zahlbruckner A. in Engler A. & Prantl K., Nat. Pflanzenfam. ed. 2, vol. 8 (1926).

Biogeography: Checklist records: Italy and Sonoran Desert (both records: Scheidegger, ined.).

Lichen Photobionts: Primary photobiont present; chlorococcal. Secondary photobiont absent.

Thallus: Crustose, areolate (primarily areolate). Thallus Outline: Soon disappearing. Upper Surface: Brown; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent.

Medulla: Iodine reaction in Lugol's solution negative; not different with or without KOH pre-treatment (euamyloid).

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular or lingulate, forming all across the thallus surface, not emerging (aspicilioid), becoming adnate. Wall: Not carbonized, not fused. Margin: Indistinct; external filaments absent. Exciple: White. Periphyses: Absent. Epithecium: Apical cells brown or red. Hymenium: Iodine reaction: Lugol’s positive, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

Asci: Tholus thickened, amyloid, with amyloid cap (like a collar); ocular chamber indistinct; dehiscence lecanoralean; exoascus euamyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, reniform, curved, or semilunate, 7-17 µm long, 2-6 µm wide, obtuse or aciculate; septa absent; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial; immersed, formed all accross the thallus surface.

Conidiogeneous Cells: Apical or intercalar. Conidia: Globose or ellipsoid; microconidial, not branched; aseptate; cell wall hyaline.

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