Rinodina exigua (Ach.) Gray

Nat. Arrang. Brit. Plants, 1: 450, 1821. Basionym: Lichen exiguus Ach. - Lichenogr. Suec. Prodr.: 69, 1799.
Synonyms: Berengeria exigua (Ach.) Trevis.; Rinodina kornhuberi Zahlbr.
Distribution: N - VG, Frl, Ven (Nimis & al. 1996c, Caniglia & al. 1999, Lazzarin 2000, Thor & Nascimbene 2007), TAA (Nascimbene 2005b, 2014, Nascimbene & al. 2006e, 2007b, 2008c, 2022, Nascimbene & Marini 2015, Nimis & al. 2015, Trindade & al. 2021), Lomb (Grieco & Groppali 1995, Brusoni & al. 1997, Zocchi & al. 1997, Brusoni & Valcuvia 2000, Arosio & al. 2003, Furlanetto 2010), Piem (Piervittori 1998, 2003, Isocrono & al. 2004, Furlanetto 2010, Matteucci & al. 2010), VA (Piervittori & Isocrono 1999, Valcuvia 2000, Valcuvia & al. 2000b, Matteucci & al. 2008c), Emil (Bassi 1995, Nimis & al. 1996, Valcuvia & Savino 2000, Marconi & al. 2006, Fariselli & al. 2020), Lig. C - Tosc (Loppi & al. 1997b, 1998, 2002b, Putortì & al. 1998, Benesperi & al. 2007, Brunialti & Frati 2010, Brackel 2015, Nascimbene & al. 2015), Umb (Ravera 1998, Ravera & al. 2006), Laz (Bartoli & al. 1997, Ruisi & al. 2005, Ravera 2008b), Abr (Olivieri & al. 1997, 1997b, Loppi & al. 1999, Nimis & Tretiach 1999, Brackel 2015, Caporale & al. 2016), Mol (Caporale & al. 2008, Caporale & Ravera 2020), Sar (Zedda 2002, 2002b, Rizzi & al. 2011, Cossu 2013, Di Nuzzo & al. 2022). S - Camp (Ricciardi & al. 2000, Aprile & al. 2003b, Catalano & al. 2016), Pugl (Brackel 2011), Bas (Potenza 2006, Brackel 2011), Cal (Puntillo 1995, 1996, Incerti & Nimis 2006), Si (Grillo & Cristaudo 1995, Grillo & Carfì 1997, Grillo 1998, Grillo & al. 2002, Grillo & Caniglia 2004, 2006, Brackel 2008b).
Description: Thallus crustose, thinly episubstratic, rimose, granulose, or rarely areolate-verrucose, sometimes indistinct but always present around the apothecia, poorly delimited, glaucous whitish grey, without a distinct prothallus. Apothecia lecanorine, 0.3-0.7 mm across, immersed to adnate, usually numerous, with an initially dark brown, then soon black, flat to convex, epruinose disc, and a thin, often finally excluded thalline margin. Thalline exciple with an indistinct, up to 10-20 μm thick cortex reacting I-; proper exciple 10-15 µm thick laterally, expanding to 10-30 µm in upper part, pale brown to colourless, I-; epithecium orange brown to dark brown; hymenium colourless, 70-90 µm high, I+ blue; apical cells of paraphyses up to 4 µm wide, with a dark cap; hypothecium colourless to pale brown, I+ blue. Asci 8-spored, clavate, the K/I+ blue tholus penetrated by a faintly amyloid apical cushion with parallel or diverging flanks, the wall K/I-, surrounded by a K/I+ blue outer layer, Lecanora-type. Ascospores 1-septate, brown, ellipsoid, (13-)15-18(-21) x (6.5-)7-9(-10) µm, Physcia-type, with ontogeny of type A. Photobiont chlorococcoid. Spot tests: thallus K+ faintly yellow, C-, KC-, P+ faintly yellow or P-. Chemistry: thallus with atranorin.
Note: a temperate species found on the smooth bark of isolated trees, more rarely on rather eutrophicated wood. It is certainly widespread throughout Italy, but many records need to be checked; the epithets “exigua” and “pyrina” were often used by those who work on biomonitoring for any Rinodina they encountered, without much regard to the many other epiphytic species occurring in Italy.
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Pioneer species

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: rare
Oromediterranean belt: absent
Montane belt: rather rare
Submediterranean belt: rather common
Padanian area: extremely rare
Humid submediterranean belt: common
Humid mediterranean belt: rather rare
Dry mediterranean belt: extremely rare

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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Predictive model
Herbarium samples
Index Fungorum GBIF

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



P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (15288)
2008.03.06



P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (25226)
2008.03.06


Harrie Sipman - Source: https://archive.bgbm.org/sipman/Zschackia/AegeanLichens/Rinodina.htm


Harrie Sipman - Source: https://archive.bgbm.org/sipman/Zschackia/AegeanLichens/Rinodina.htm


Harrie Sipman - Source: https://archive.bgbm.org/sipman/Zschackia/AegeanLichens/Rinodina.htm


Harrie Sipman - Source: https://archive.bgbm.org/sipman/Zschackia/AegeanLichens/Rinodina.htm


Harrie Sipman - Source: https://archive.bgbm.org/sipman/Zschackia/AegeanLichens/Rinodina.htm


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


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_R/Rinodina_exigua.htm
France, 24/3/2014 - D957 Miluccia Bocca di Feliciolu, alt.: 800m - Olmeto - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_R/Rinodina_exigua.htm
France, 24/3/2014 - D957 Miluccia Bocca di Feliciolu, alt.: 800m - Olmeto - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_R/Rinodina_exigua.htm
France, 24/3/2014 - D957 Miluccia Bocca di Feliciolu, alt.: 800m - Olmeto - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_R/Rinodina_exigua.htm
France, 24/3/2014 - D957 Miluccia Bocca di Feliciolu, alt.: 800m - Olmeto - Corse