Type locality: Portugal, Madeira Islands, Madeira, between Queimadas and Caldeirão Verde, on twigs of Ericae, c. 900 m, 9 August 1951 (Typus, a.* 4576), C. N. Tavares 4576 (Tavares - holotype).

Type locality coordinates: Data lacking.

ITS barcode: Data lacking.

Description: Lichen. Thallus grey, very irregularly branched, locker angeheftet, Lappen hohl, aufgeblasen, 1-3 mm breit, teils mit kleinen Sekundärläppchen, stellenweise durch vorwölbende untere Rinde schwarz gesäumt, Unterrinde rhizinenfrei, schwarz, glänzend. Cilia lacking, isidia lacking, soralia lacking. Apothecia frequent, up to 8 mm broad, auf holem trichterförmigem Stiel. Sporen breit ellipsoidisch bis fast kugelförmig, 7-9 /5-8 µm.

Photobiont: Green alga.

Chemistry: Cortex K+ yellow, C-, KC-, P-, medulla K+ yellow, C-, KC-, P-. Atranorin, physodic acid (major), oxyphysodic acid (trace).

Ecology: On bark in laurel forest, mostly on twigs.

Distribution type: Endemic on Madeira (Hawksworth 1973: 455).

Taxonomy: "H. madeirensis shows some superficial similarity to H. tavaresii, but the latter is larger and its medulla reacts PD+ bright yellow (Hawksworth 1973)" (Pisut 2009: 181).

Note: Hernandez-Padron (2010) uses the spelling Hypogymnia "maderensis". - IF: Hypogymnia madeirensis (Tav.) D. Hawksw. - Hawksworth (1973: 455): Hypogymnia madeirensis (Tav.) D. Hawksw.

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Molecular Database: Genbank

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