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Diploicia canescens (Dicks.) Massal.

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. Usually: C-, K+ yellow → brown-yellow, KC+ yellow → brown-yellow, P- but there are many chemotypes in particular a P+ yellow chemotype, see: Diploicia canescens forme P+ jaune, UV+/- orange, K/UV +/- green. 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. see: Diploicia canescens forme saxicole, rarer on wood: Diploicia canescens forme lignicole, or on plastic substrates: Diploicia canescens forme sur substrats artificiels.

N.B. In this highly polymorphic species, 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. There are also many chemotypes.

N.B. In the Mediterranean region or in Macaronesia, but also in Brittany in hot areas, a very similar taxon may be found: Diploicia subcanescens., thermophilic, on coastal siliceous rocks with abortive soralia restricted to greyish warts.





Diploicia canescens (Dicks.) Massal.

Diploicia canescens Camfrout
Alain GERAULT

Diploicia canescens (Dicks.) Massal.

Diploicia canescens Le Passage 1
Alain GERAULT

Diploicia canescens (Dicks.) Massal.

Diploicia canescens Le Passage 2
Alain GERAULT

Diploicia canescens (Dicks.) Massal.

Diploicia canescens Pointe d'Armorique
Michel DAVID

Diploicia canescens (Dicks.) Massal.

Diploicia canescens Ouessant
Marie-Claude DERRIEN

Diploicia canescens (Dicks.) Massal.

Diploicia canescens Ile d'Aix
Joël QUERELLOU

Diploicia canescens (Dicks.) Massal.

Diploicia canescens Fertile Dolmen de Telgruc
Michel DAVID

Diploicia canescens (Dicks.) Massal.

Dipoicia canescens Fertile Crozon
Michel DAVID

Diploicia canescens (Dicks.) Massal.

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

Diploicia canescens (Dicks.) Massal.

Diploicia canescens fertile Crozon 2
Bernard BOUFFINIER

Diploicia canescens (Dicks.) Massal.

Diploicia canescens Sur mur Daoulas
Joël QUERELLOU

Diploicia canescens (Dicks.) Massal.

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

Diploicia canescens (Dicks.) Massal.

Diploicia canescens Asque Saint-Brieuc 2
Jacques HAINE

Diploicia canescens (Dicks.) Massal.

Diploicia canescens Spores Saint-Brieuc 3
Jacques HAINE

Diploicia canescens (Dicks.) Massal.

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

Diploicia canescens (Dicks.) Massal.

Diploicia canescens fertile Lesconil 2
Bernard BOUFFINIER

Diploicia canescens (Dicks.) Massal.

Diploicia canescens K/UV Pointe de Pen-Hir 1
Bernard BOUFFINIER



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