Blastenia ferruginea (Huds.) A. Massal.

Flora, 35: 574, 1852. Basionym: Lichen ferrugineus Huds. - Fl. Angl.: 444, 1762.
Synonyms: Biatora ferruginea (Huds.) Fr.; Blastenia ferruginea var. corticicola (Flot.) Anzi; Callopisma ferrugineum (Huds.) Trevis.; Caloplaca aurantiaca (Lightf.) Th. Fr. non auct.; Caloplaca ferruginea (Huds.) Th. Fr.; Placodium ferrugineum (Huds.) Hepp
Description: Thallus crustose, episubstratic, pale grey to almost white, smooth to usually warted, forming up to 5 cm wide patches, sometimes delimited by a blackish prothallus. Apothecia common, biatorine/zeorine, sessile and constricted at base, (0.5-)1-2(-2.5) mm across, with a rust red, usually flat disc and a concolorous, persistent, often flexuose proper margin. Proper exciple prosoplectenchymatous, non-amyloid, K+ red, C+ purple in section; epithecium orange-brown, granular, K+ red, C-; hymenium colourless, (60-)70-100(-130) µm high, not inspersed with oil droplets, amyloid; paraphyses simple or sparingly branched in upper part, 1.5-2 μm thick, the apical cells 2.5-3 μm wide; hypothecium colourless, not amyloid. Asci 8-spored, clavate, functionally unitunicate, apically thickened with a broad internal beak, the inner part of apex and external cap I+ blue, Teloschistes-type. Ascospores 2-celled, polarilocular, hyaline ellipsoid, 12-18 x 6-10 μm, the equatorial thickening (“septum”) (4-)6-7(-8) μm. Pycnidia red in apical parts. Conidia bacilliform, rarely narrowly ellipsoid, 3-5 x 1-1.5 μm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-; apothecia K+ red; pycnidia and apothecial margin K+ red, C+ purple in section. Chemistry: non-chlorinated anthraquinones in apothecial disc; chlorinated anthraquinones in exciple and pycnidial wall; thallus without or rarely with traces of anthraquinones; Cinereorufa-green pigment in prothallus.
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Montane belt: extremely rare
Dry submediterranean belt: rather common
Humid submediterranean belt: rather common
Padanian area: extremely rare

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Rarity

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Occurrence data
Predictive map
Model ImageCurrent prediction (1981-2010)
Model ImageFuture prediction (2071-2100) SSP 1-2.6
Model ImageFuture prediction (2071-2100) SSP 5-8.5
Predictive maps according to Francesconi et al. 2025

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (29646)
2001/12/03


P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (31774)
2008.03.03


Domenico Puntillo; Owner: Domenico Puntillo
Italy


Domenico Puntillo; Owner: Domenico Puntillo
Italy


Jan Vondrak - Source: https://botanika.prf.jcu.cz/lichenology/index.php?pg=8&cat=32&idx=15995


P.L. Nimis CC BY-SA 04
TSB 43731


Giovanna Potenza
Italy, M. Pierfaone 2014, Basilicata


Collezione lichenologica Abramo Massalongo del Museo di Storia Naturale G. Ligabue di Venezia - Autori: Seggi, Linda; Trabucco, Raffaella Proprietà: Fondazione Musei Civici di Venezia - CC BY-NC
Italy, Veneto, Ad cerasi truncos In opp. Progno 1855


Collezione lichenologica Abramo Massalongo del Museo di Storia Naturale G. Ligabue di Venezia - Autori: Seggi, Linda; Trabucco, Raffaella Proprietà: Fondazione Musei Civici di Venezia - CC BY-NC
Italy, Veneto, in op. Bolca
Blastenia ferruginea f. saxicola Massal.