Protoparmeliopsis versicolor (Pers.) M. Choisy

Contr. Lichénogr., 2: no. 13, 1931. Basionym: Lichen versicolor Pers. - Ann. Bot. (Usteri), 1: 24, 1794.
Synonyms: Lecanora alboeffigurata (Anzi) Jatta; Lecanora albomarginata (Nyl. ex Th. Fr.) Cromb.; Lecanora muralis var. albopulverulenta (Schaer.) Rabenh.; Lecanora muralis var. versicolor (Pers.) Tuck.; Placodium albopulverulentum (Schaer.) A. Massal.; Placodium versicolor (Pers.) Frege; Squamaria alboeffigurata Anzi; Squamaria saxicola var. diffracta f. dealbata Anzi
Description: Thallus crustose-placodioid, episubstratic, forming up to 10 cm wide, orbicular rosettes, pale yellowish green, but often appearing white because of a dense white pruina, areolate in central parts, lobed at margins. Lobes 0.5-1(-1.5) mm wide, concave to flat, contiguous, separated by thin white lines, smooth and wax-like, densely white-pruinose; lower surface corticate, dull whitish to pale brown. Upper cortex 50-75 µm (or more) thick, inspersed with yellowish granules which are soluble in K and insoluble in N, overlain by a 10-15 µm thick epinecral layer filled with colourless crystals; medulla white, rather loose; lower cortex poorly developed, mostly confined to the tips or margins of lobes. Apothecia usually numerous, lecanorine, masking the surface in thallus center, 0.5-1.5(-2) mm across, sessile, with a flat, yellow-brown to ochre-brown disc and a smooth to minutely crenulate, whitish, pruinose, persistent thalline margin (sometimes excluded in very old apothecia). Thalline exciple corticate, paraplectenchymatous; proper exciple thin, prosoplectenchymatous; epithecium pale yellow to brown, with granular crystals not dissolving in K; hymenium colourless, 50-80 µm high, I+ blue; paraphyses coherent, 2-3 µm thick, mainly simple or sparingly branched in upper part, the apical cells not strongly swollen; hypothecium colourless to yellowish. Asci 8-spored, elongate-clavate, very thin-walled, with a K/I+ blue, tall tholus penetrated by a faintly amyloid apical cushion, the wall K/I-, surrounded by a K/I+ blue outer layer, Lecanora-type. Ascospores 1-celled, hyaline, ellipsoid, 8-15(-16) x (3-)5-7 µm. Conidia thread-like, straight or curved. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC- or KC+ pale yellow, P-. Chemistry: cortex with usnic acid, medulla with zeorin and traces of murolic and psoromic acids.
Growth form: Crustose placodiomorph
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: very rare
Montane belt: rather rare
Dry submediterranean belt: very common
Humid submediterranean belt: very common
Padanian area: very rare

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Rarity

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Predictive map

Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/
as P. muralis


Pier Luigi Nimis; Owner: Department of Life Sciences, University of Trieste
Italy, Friuli Venezia Giulia, Trieste, Trieste Karst, Val Rosandra, San Lorenzo near Belvedere
11/02/2017


Pier Luigi Nimis; Owner: Department of Life Sciences, University of Trieste
Italy, Friuli Venezia Giulia, Trieste, Trieste Karst, Val Rosandra, San Lorenzo near Belvedere
11/02/2017


Pier Luigi Nimis; Owner: Department of Life Sciences, University of Trieste
Italy, Friuli Venezia Giulia, Trieste, Trieste Karst, Val Rosandra, San Lorenzo near Belvedere
11/02/2017


Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/
as P. muralis


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


Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/
as P. muralis


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=959&lang=en
France, Corse, Cap Corse


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=959&lang=en
France, Corse, Cap Corse


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=959&lang=en
France, Corse, Cap Corse


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=959&lang=en
France, Pays Basque, Pic de Gorramakil


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=959&lang=en
France, Pays Basque, Pic de Gorramakil


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=959&lang=en
France, Pays Basque, Pic de Gorramakil


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=959&lang=en
France, Pays Basque, Pic de Gorramakil


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=959&lang=en
France, Pays Basque, Pic de Gorramakil


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=959&lang=en
France, Pays Basque, Pic de Gorramakil


Sebastiano Dose - CC BY 4.0
Armenia, Vayots Dzor Province, municipality of Areni, on a big boulder close to the Areni-1 cave in the proximity of the bar/restaurant on the Noravank Monastery Road; on sandstone and conglomerate/calcareous rocks. 39°43’54” N/ 45°12’14” E, ca 1050 m, 28.09.2024. leg., Dose, Nimis & Muggia TSB 45064