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Diploicia canescens (Dicks.) Massal.

Synonyms:

Family: PHYSIACEAE

Habitat: Ubiquitous

Description

    Thallus forming rosettes, 3-8 cm diam., across with clearly defined contiguous lobes radiating from the center, up to 1 mm wide, pleated, convex, pruinose, whitish, pale grey, grey-glaucous, granular or farinose soralia dispersed in the center, sometimes in patches or mats, dull grey-yellow, occasionally greenish due to algae. Seldom fertile in our prospection area, but fertile thalli may commonly be found near the sea shore, apothecia 0.3-1 mm diam., disc black, thin black margin. Ascospores broadly ellipsoid, brown, polarilocular,  1-septate, 10-15 x 5-8 µm. Photobiont : chlorococcoide. C-, K+ yellow, KC+ yellow, Pd-. Very common on basic and very nutrient-enriched substrata, tolerant to pollution, not especially maritime but rather abundant near the sea shore particularly on dikes, walls, ageing harbour facilities, bark of trees in cities, etc. N.B. In this highly polymorphic species (see Diploicia canescens forma 1 & Diploicia canescens forma 2), the frequence of well developed thalli is rather low compared to those of reduced or incomplete thalli found on cement walls in wasteland and requiring much more attention to be identified. N.B. In the Mediterranean region or in Macaronesia, a very similar taxon may be found: Diploicia subcanescens., thermophilic, on coastal siliceous rocks with abortive soralia restricted to greyish warts.







Diploicia canescens Camfrout
Alain GERAULT



Diploicia canescens Le Passage 1
Alain GERAULT



Diploicia canescens Le Passage 2
Alain GERAULT



Diploicia canescens Pointe d'Armorique
Michel DAVID



Diploicia canescens Ouessant
Marie-Claude DERRIEN



Diploicia canescens Ile d'Aix
Joël QUERELLOU



Diploicia canescens Fertile Dolmen de Telgruc
Michel DAVID



Dipoicia canescens Fertile Crozon
Michel DAVID



Diploicia canescens Sur bois peint d'encadrement de fenêtre Brest
Joël QUERELLOU



Diploicia canescens fertile Crozon 2
Bernard BOUFFINIER



Diploicia canescens Sur mur Daoulas
Joël QUERELLOU



Diploicia canescens Asque dans le rouge Congo Saint-Brieuc 1
Jacques HAINE



Diploicia canescens Asque Saint-Brieuc 2
Jacques HAINE



Diploicia canescens Spores Saint-Brieuc 3
Jacques HAINE



Diploicia canescens fertile avec Parmotrema perlatum & Flavoparmelia caperata Lesconil 1
Bernard BOUFFINIER



Diploicia canescens fertile Lesconil 2
Bernard BOUFFINIER



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