Français English

Xanthoria calcicola Oxner var. calcicola

Synonyms:

Family: TELOSCHISTACEAE

Habitat: Ubiquitous

Description

     Thallus folliaceous generally arranged in a rossette, up to 15 cm in diameter, formed, especially at the margin, of 3-5 m wide lobes overlapping each other, folded and wavy, covering from the center with granules and of isidioid warts, upper surface: yellow-orange in areas with little sunlight, bright orange in areas with sun, the center may become more dirty orange-brownish. Apothecia rare and few, sometimes absent, flat bright orange disc, paler margin sometimes crenate. Elliptical, polarilocular, colorless spores, 10-17 x 5-9 µm according to the literature, 12-17 x 6-9 µm according to our measurements. K + purple. Fairly common species found on limestone rocks (as its name suggests!) or very little acid, cement, concrete, very rarely on wood or tree bark, nitrophilic and supporting urban pollution.

     The "maritime" forms differ by their occurrence on acidic coastal rocks and are sometimes difficult to separate from certain forms of Xanthoria parietina but this last species has green tones that Xanthoria calcicola does not always (?) orange, it also has more apothecia and no isidioid granulations; and Xanthoria aureola with narrow lobes strap-schaped.







Xanthoria calcicola var. calcicola Belgique Ardennes S1
Jacques HAINE



Xanthoria calcicola var. calcicola Belgique Ardennes S2
Jacques HAINE



Xanthoria calcicola var. calcicola Belgique Ardennes S3
Jacques HAINE



Xanthoria calcicola var. calcicola Belgique Ardennes S4
Jacques HAINE



Xanthoria calcicola var. calcicola Belgique Ardennes S5
Jacques HAINE



Xanthoria calcicola var. calcicola Coupe apothécie KOH Belgique Ardennes S6
Jacques HAINE



Xanthoria calcicola var. calcicola Coupes apothécie Bleu Coton Belgique Ardennes S7
Jacques HAINE



Xanthoria calcicola var. calcicola Asque KOH Belgique Ardennes S8
Jacques HAINE



Xanthoria calcicola var. calcicola Asque Bleu Coton Belgique Ardennes S9
Jacques HAINE



Xanthoria calcicola var. calcicola Asques et spores Lugol Belgique Ardennes S10
Jacques HAINE



Xanthoria calcicola var. calcicola Spores et algues KOH Belgique Ardennes S11
Jacques HAINE



Xanthoria calcicola var. calcicola Spores bleu coton Belgique Ardennes S12
Jacques HAINE



Return
Content : Alain Gérault - Website development : Sylvain Ard - Hosting : Online.net