Rinodina oxydata (A. Massal.) A. Massal.

Geneac. Lich.: 19, 1854. Basionym: Mischoblastia oxydata A. Massal. - Ric. Auton. Lich. Crost.: 42, 1852.
Synonyms: Berengeria oxydata (A. Massal.) Trevis.; Buellia discolor (Hepp) Anzi; Buellia discolor var. candida (Arnold) Anzi; Buellia griseonigra (Nyl.) Zahlbr.; Lecanora contribuens Nyl.; Lecanora discolorans (Arnold) Nyl.; Lecanora dissentanea Nyl.; Lecanora griseofusca Nyl.; Lecanora intuta Nyl.; Lecidea discolor Hepp; Rinodina aequalis (Nyl.) Zahlbr.; Rinodina biatorina Körb.; Rinodina candida Arnold; Rinodina concava B. de Lesd.; Rinodina contribuens (Nyl.) Boistel; Rinodina discolor (Hepp) Arnold; Rinodina dissimilis Anzi; Rinodina griseofusca (Nyl.) H. Olivier; Rinodina griseonigra (Nyl.) Zahlbr.; Rinodina imitatrix Zahlbr.; Rinodina intuta (Nyl.) H. Olivier; Rinodina lecideotropa (Nyl.) Zahlbr.; Rinodina oxydata var. squamulosa Bagl.; Rinodina subarenaria A.L. Sm.
Distribution: N - Ven (Lazzarin 2000b), TAA, Lomb (De Vita & Valcuvia 2004), Piem (Isocrono & al. 2004), VA (Piervittori & Isocrono 1999, Isocrono & al. 2008), Lig. C - Tosc (Ravera & al. 2019a), Sar (Rambold & al. 1994, Rizzi & al. 2011, Giordani & al. 2013).
Description: Thallus crustose, episubstratic, to 0.5 mm thick, areolate, without a distinct prothallus. Areoles up to 1.3-1.4 mm wide, contiguous, flat, whitish to grey, rarely grey-brown, dull. Apothecia pseudolecanorine to lecideine, innate to adnate, 0.3-1 mm across, with a black, flat to slightly convex disc and a black, often sinuous proper margin. Proper exciple colourless, 10-15 µm laterally, to 15-20 µm in upper part; epithecium reddish brown; hymenium colourless, 80-110 µm high; paraphyses 1.5-2 µm thick in lower part, conglutinate, the apical cells to 3-3.5 µm wide, immersed in a dispersed pigment; hypothecium colourless to pale brown, 70-180 µm high. Asci 8-spored, clavate, Lecanora-type. Ascospores 1-septate, brown, ellipsoid, 13-18 x 7-11 µm, with rugulate-ornamented walls, Milvina-type, with ontogeny of type A (apical wall thickening after septum formation). Pycnidia immersed in thallus. Conidia bacilliform, 5-6 µm long. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: zeorin.
Note: a temperate to tropical, widespread species known from from southern Africa, Asia, Australia, North and South America, Macaronesia and Europe, found on seepage tracks of (mostly) base-rich, hard, smooth metamorphic rocks, often along mountain creeks. The species is widespread in the Alps, but has been also reported from the Mediterranean mountains.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Subcontinental: restricted to areas with a dry-subcontinental climate (e.g. dry Alpine valleys, parts of Mediterranean Italy)

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: rare
Submediterranean belt: very rare
Padanian area: absent
Humid submediterranean belt: very rare
Humid mediterranean belt: absent
Dry mediterranean belt: absent


pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Harrie Sipman - CC-BY-SA-NC - Source: http://www.tropicallichens.net/4060.html


Author: Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php