Hedwigia 31: 35 (1892).

Basionym: Urceolaria gypsacea Ach., Lich. Univ.: 338 (1810).

Type locality: Switzerland, Schleicher (GOET - lectotype). Designated by Lumbsch (1988: 22).

Type locality coordinates: Data lacking.

Molecular barcode: Data lacking.

Thallus: crustose, rimosely areolate, greyish-white pruina giving the thallus a farinose appearance, c. 1-3 mm thick, covered by an epinecral layer. Apothecia urceolate, to 5 mm diam. Excipulum proprium pseudoparenchymatous, brown, with periphysoids. Hypothecium hyaline, c. 15 µm thick. Hymenium 120-190 µm tall, I-. Paraphyses simple, 1-2 µm broad. Asci I-, subclavate to cylindrical, 90-130 x 20-30 µm, 4-spored. Ascospores brown, muriform, 25-40 x 10-17 µm, with 4-7 transverse and 1-2 longitudinal septa. Anamorph unknown (Lumbsch 1988: 22).

Photobiont: Trebouxia spec.

Chemistry: Lecanoric acid by TLC, K-, C+ red, PD - (Lumbsch 1988: 23). Lecanoric acid and orsellinic acid (Pérez-Vargas et al. 2012: 69).

Ecology: Saxicolous, on calcareous substrata in shaded habitats, in Europe a typical member of the Gyalectetum jenensis (James et al. 1977). (Lumbsch 1988: 23).

Distribution Type: Cosomopolitan, Eurasia, northern Africa, North and South America (Lumbsch 1988: 23).

Taxonomy: Data lacking.

Note: "The presence of D. gypsaceus in the Canary Islands is very doubtful. Hernández-Padrón & Pérez-Vargas (2009) included this species in the Checklist of the Lichen Biota of the Canary Islands from La Palma, Tenerife and Gran Canaria Island. However, a review of these records has shown that all are based on misidentification, or incorrect interpretations of alternative names given to this species ... " (Pérez-Vargas et al. 2012: 70).

Distribution Database: Distributions

Picture Database: Tropical Lichens

Molecular Database: Genbank

Synonym Database: Index Fungorum

Synonym Database: Mycobank