Miriquidica deusta (Stenh.) Hertel & Rambold

Mitt. bot. Staatss. München, 23: 383, 1987. Basionym: Lecidea fuscoatra var. deusta Stenh. - Nov. Sched. Crit. Lich. Suec., 14: 9, 1833.
Synonyms: Lecidea deustata Zahlbr.; Lecidea secernens H. Magn.
Distribution: N - Frl (Tretiach & Hafellner 2000), TAA. C - Tosc (Ravera & al. 2018b), Sar (Hafellner & al. 2014, Rizzi & al. 2011, Giordani & al. 2013). S - Si (Nimis & al. 1996b).
Description: Thallus crustose, episubstratic, 0.1-0.4 mm thick, areolate, consisting of (0.3-)0.5-1(-1.5) mm wide, slightly concave to slightly convex, dark brown to black-brown, glossy areoles with whitish to finally blackish margins, more or less scattered on a conspicuous black hypothallus. Cortex overlain with a thick epinecral layer; medulla white, I-. Apothecia lecideine, at first immersed, then slightly prominent, (0.4-)0.5-0.9(-1.2) mm across, with a flat to slightly convex, black, epruinose disc, and a thin, rarely grey-pruinose proper margin. Proper exciple grey-brown to aeruginose green in outer part, pale grey within; epithecium blackish brown to olive-brown; hymenium colourless to yellowish, (30-)50-60 µm high, I+ blue; paraphyses sparingly branched and more or less anastomosing, 1.5-2 µm thick at mid-level, the apical cell clavate, 3-5.5 µm wide, with a dark cap; hypothecium colourless, yellowish or pale grey. Asci 8-spored, broadly cylindrical to subclavate, more or less of the Lecanora-type, but with a weakly defined apical cushion and ocular chamber. Ascospores 1-celled, hyaline, ellipsoid to oblong, (8-)10-12(-14) x (3.5-)4-5.5(-7) µm. Pycnidia black, immersed. Conidia thread-like, curved, (18-)25-35 x (0.5)0.8-1 µm. Photobiont chlorococcoid. Spot tests: thallus and medulla K-, C-, KC-, P-. Chemistry: miriquidic acid, rarely additional lobaric acid.
Note: a much misunderstood and overlooked (being mostly sterile) species, with a probably western and southern distribution in Europe, which is fairly common in some parts of Italy (e.g. Sardegna) on exposed surfaces of base-rich siliceous rocks, with a wide altitudinal range, sometimes starting the life-cycle on other crustose lichens.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
paras crustose lichens when young

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: extremely rare
Oromediterranean belt: very rare
Montane belt: extremely rare
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: extremely rare
Humid mediterranean belt: very rare
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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Predictive model
Herbarium samples

Felix Schumm- CC BY-SA 4.0
[19724], Italia, Sardinia, Prov. Cagliari, Reservatum naturae Monte Arcosu, supra domum forestalem Casa Perdu Melis, loco Concale Petuntu dicto, 520 m, ad saxa silicea aprica. Leg. P. L. Nimis, C. Roux, M. Tretiach & A. Vezda, 29.08.1989. VEZDA: LICHENES SELECTI EXSICCATI 2414


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


Felix Schumm- CC BY-SA 4.0
[19724], Italia, Sardinia, Prov. Cagliari, Reservatum naturae Monte Arcosu, supra domum forestalem Casa Perdu Melis, loco Concale Petuntu dicto, 520 m, ad saxa silicea aprica. Leg. P. L. Nimis, C. Roux, M. Tretiach & A. Vezda, 29.08.1989. VEZDA: LICHENES SELECTI EXSICCATI 2414


Felix Schumm- CC BY-SA 4.0
[19724], Italia, Sardinia, Prov. Cagliari, Reservatum naturae Monte Arcosu, supra domum forestalem Casa Perdu Melis, loco Concale Petuntu dicto, 520 m, ad saxa silicea aprica. Leg. P. L. Nimis, C. Roux, M. Tretiach & A. Vezda, 29.08.1989. VEZDA: LICHENES SELECTI EXSICCATI 2414


Felix Schumm- CC BY-SA 4.0
[19724], Italia, Sardinia, Prov. Cagliari, Reservatum naturae Monte Arcosu, supra domum forestalem Casa Perdu Melis, loco Concale Petuntu dicto, 520 m, ad saxa silicea aprica. Leg. P. L. Nimis, C. Roux, M. Tretiach & A. Vezda, 29.08.1989. VEZDA: LICHENES SELECTI EXSICCATI 2414
L: lobaric acid



P.L. Nimis CC BY-SA 4.0
TSB 14655