Squamarina gypsacea (Sm.) Poelt
Mitt. bot. Staatss. München, 2: 539, 1958. Basionym: Lichen gypsaceus Sm. - Trans. Linn. Soc. London, 1: 81, 1791.
Synonyms: Lecanora crassa var. gypsacea (Sm.) Rabenh.; Lecanora fragilis Zahlbr.; Lecanora gypsacea (Sm.) Müll. Arg.; Lecanora smithii (Ach.) Ach.; Placodium gypsaceum (Sm.) Trevis.; Psoroma gypsaceum (Sm.) A. Massal.; Squamaria gypsacea (Sm.) Nyl.
Distribution: N - VG, Frl, Ven, TAA, Lomb, Piem, Emil (Tretiach & al. 2008, Fariselli & al. 2020), Lig. C - Tosc (Benesperi 2006, Benesperi & Lastrucci 2007, Lastrucci & al. 2009, Brackel 2015), Marc, Umb (Genovesi & Ravera 2001, Ravera & al. 2006), Laz (Nimis & Tretiach 2004), Abr (Gheza & al. 2021), Mol (Nimis & Tretiach 1999, Caporale & al. 2008, Genovesi & Ravera 2014), Sar. S - Camp (Aprile & al. 2003b, Nimis & Tretiach 2004, Garofalo & al. 2010), Pugl (Nimis & Tretiach 1999), Bas (Nimis & Tretiach 1999), Cal (Puntillo 1996), Si (Nimis & al. 1994, 1996b, Ottonello & al. 1994, 2011, Ottonello 1996, Ottonello & Romano 1997, Grillo 1998, Grillo & Caniglia 2004).
Description: Thallus squamulose, rather firmly attached, consisting of usually dispersed, more or less isodiametrical to slightly elongate, concave, to 8 mm broad and to 3-5 mm thick squamules, the upper surface green, the margins conspicuously white. Lower surface white at margins, dark in central parts. Upper cortex inspersed with pale brown granules dissolving in K, overlain by a thin epinecral layer; medulla white, thick, filled with calcium oxalate crystals; lower cortex absent Apothecia rather rare, lecanorine, sessile, with a flat to slightly convex, 1-1.5 mm broad, sometimes slightly white pruinose, pale brown disc and a thin, often finally disappearing thalline margin. Cortex of thalline exciple similar to that of the thallus; proper exciple reduced to a thin ring; epithecium brown with pale brown granules dissolving in K and calcium oxalate crystals; hymenium colourless, inspersed with granules dissolving in K, I+ blue; paraphyses mostly simple, c. 2 μm thick; hypothecium with pale brown granules dissolving in K, not subtended by an algal layer. Asci 8-spored, narrowly clavate, the wall I+ blue, with a I+ blue apical dome, without axial mass, Bacidia-type. Ascospores 1-celled, hyaline, narrowly ellipsoid with rounded ends, 10-15 x 4-7 μm. Photobiont chlorococcoid. Spot tests: cortex K-, C-, KC- or KC+ yellowish, P , UV-; medulla P+ yellow. Chemistry: cortex with usnic and isousnic acid, medulla with psoromic acid.Note: in fissures of calcareous boulders, sometimes also directly on rock, with optimum in the Mediterranean-submediterranean belts, often growing on the thalli of Romjularia lurida. Most records from above treeline refer to S. subcetrarioides.
Growth form: Squamulose
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)
paras Romjularia lurida
Commonnes-rarity: (info)
Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: very rare
Montane belt: extremely rare
Submediterranean belt: rare
Padanian area: absent
Humid submediterranean belt: rare
Humid mediterranean belt: rather rare
Dry mediterranean belt: rather rare
Predictive model
Herbarium samples
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (31676)
2001/12/11
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (31676)
2001/12/11
apothecium
Growth form: Squamulose
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)
paras Romjularia lurida
Commonnes-rarity: (info)
Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: very rare
Montane belt: extremely rare
Submediterranean belt: rare
Padanian area: absent
Humid submediterranean belt: rare
Humid mediterranean belt: rather rare
Dry mediterranean belt: rather rare
Predictive model
Herbarium samples |