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Rinodina luridescens (Anzi) Arnold

Synonyms:

Family: PHYSCIACEAE

Habitat: Xeric supralittoral  zone

Description

    Thallus crustose, usually thick, up to 10-12 cm diam., cracked, areolate, areoles 1.25-2.5 mm across, mosaic-forming, greyish, grey-brownish, typically with purple tinge, prothallus dark grey, brown-blackish, usually visible. Apothecia usually numerous, clustered towards the center, 0.5-1.5 mm diam., more or less immersed in the thallus, thalline exciple very thin, blackish (darker than the thallus), inconspicuous then excluded, disc black, flat then slightly convex. Ascii 8-spored, 50-65 x 18-25 µm. Ascospores broadly ellipsoid, thick wall, large septum, 15-23 x 8-12 µm according to literature, 17-22 x 7,5-12 µm according to our measures. Photobiont: Trebouxia. Cortex : K-, C+ red orange, Pd-. Distribution restricted but locally common (and then possibly forming large conspicuous colonies characterized by their purple tinge), on well-lit and sunny siliceous rocks (mainly granite)  of the supralittoral zone. N.B. In the field, not to be confused with some Buellia taxa that differ by ascospores and chemical reactions and the absence of purple tinge nor with Rhizocarpon richardii that may have similar purple tinge.*

 







Rinodina luridescens Habitat Pointe du Raz
Alain GERAULT



Rinodina luridescens Roscanvel 2
Bernard BOUFFINIER



Rinodina luridescens Roscanvel 1
Bernard BOUFFINIER



Rinodina luridescens Pointe de Pen-Hir 7
Jacques HAINE



Rinodina luridescens Pointe de Pen-Hir 1
Bernard BOUFFINIER



Rinodina luridescens Pointe de Pen-Hir 2
Bernard BOUFFINIER



Rinodina luridescens Asques Pointe de Pen-Hir 3
Jacques HAINE



Rinodina luridescens Asque Pointe de Pen-Hir 4
Jacques HAINE



Rinodina luridescens Spores Pointe de Pen-Hir 5
Jacques HAINE



Rinodina luridescens Pointe de Pen-Hir 6
Jacques HAINE



Rinodina luridescens Pointe de Pen-Hir 8
Jacques HAINE



Rinodina luridescens Roscanvel 3
Bernard BOUFFINIER



Rinodina luridescens Roscanvel 4
Bernard BOUFFINIER



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