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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Schultz M. (00-03-02) and Scholz P. (02-05-14); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 3. Digitothyrea. Lichinaceae Nyl. (1854); Lichinales.

Type Information: Type: Digitothyrea rotundata (Büdel, Henssen & Wessels) Moreno & Egea.

Taxonomic Literature: Brusse F., Bothalia 17: 37-40 (1987); Henssen A., Mycotaxon 25 (2):
493-503 (1986); Henssen A., Büdel B. & Wessels D., Mycotaxon 22: 169-195 (1985); Henssen A. & Jörgensen P.M., Lichenologist 22: 137-147 (1990); Moreno P.P. & Egea J.M., Lichenologist 24: 215-228 (1992); Schultz M. in Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 171-173, Tempe (2002).

Lichen Photobionts: Primary photobiont present; cyanobacterial. Primary photobiont taxonomy: genus incertae sedis; Chroococcales, Cyanobacteria, Prokaryota. Secondary photobiont absent.

Thallus: Foliose or fruticose, not subdivided parts, granular, umbilicate or lobed. Thallus Outline: Soon disappearing. Upper Surface: Black; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate or isidiate; not sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by holdfasts; 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, forming all across the thallus surface or directly at the thallus margin, becoming adnate to stipitate. Wall: Not carbonized, not fused. Margin: Distinct to prominent; external filaments absent. Exciple: White. Periphyses: Absent. Epithecium: Apical cells brownish yellow. Hymenium: Iodine reaction: Lugol’s negative, hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

Asci: Tholus not thickened, not amyloid; ocular chamber indistinct; dehiscence prototunicate; exoascus not amyloid, not hemiamyloid.

Ascospores: c. 8 (sometimes fewer) per ascus, globose, broadly ellipsoid, or ellipsoid, 9-15 µm long, 7-9 µm wide, obtuse; 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 or along the thallus periphery.

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

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