Catillaria minuta (A. Massal.) Lettau

Hedwigia, 52: 135, 1912. Basionym: Biatorina minuta A. Massal. - Ric. Auton. Lich. Crost.: 137, 1852.
Synonyms: Biatorina arnoldii Kremp.; Biatorina arnoldii var. luteella (Nyl.) A.L. Sm.; Catillaria arnoldii (Kremp.) Th. Fr.
Description: Thallus crustose, entirely endosubstratic, whitish or poorly evident. Apothecia lecideine, 0.2-0.3(-0.4) mm across, yellowish brown to pale orange brown (pale yellow when wet), sessile, with a concave, then flat to slightly convex disc, and an initially prominent and smooth, finally excluded proper margin which is usually paler than disc. Proper exciple pale yellow in outer part, colourless within; epithecium pale yellowish brown, K-; hymenium colourless, 45-60 µm high; paraphyses simple, 1-1.5 µm thick at mid-level, the apical cells only slightly swollen, up to 2.5(-3) µm wide, weakly pigmented; hypothecium colourless to pale straw-coloured. Asci 8-spored, clavate, surrounded by a gelatinous I+ blue coat, with a well-developed I+ blue tholus, a I+ darker blue tube and a well-developed ocular chamber, approaching the Biatora-type. Ascospores 1-septate, slightly restricted at septum, hyaline, ellipsoid to ovoid-fusiform, (10-)12-16(-18) x 4-6.5 µm, the old ones with a microrugulate surface. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
In underhangs rarely wetted by rain

Commonnes-rarity: (info)

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

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Rarity

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P.L. Nimis CC BY-SA 4.0
TSB 24243


P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (24243)
2001/12/08


Courtesy: Olivier et Danièle Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C4/Catillaria_minuta.htm
France, Combe Lavaux - Côte-d'Or
2/6/2015


Courtesy: Olivier et Danièle Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C4/Catillaria_minuta.htm
France, Combe Lavaux - Côte-d'Or
2/6/2015


Courtesy: Olivier et Danièle Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C4/Catillaria_minuta.htm
France, Combe Lavaux - Côte-d'Or
2/6/2015


Courtesy: Olivier et Danièle Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C4/Catillaria_minuta.htm
France, Combe Lavaux - Côte-d'Or
2/6/2015


Collezione lichenologica Abramo Massalongo del Museo di Storia Naturale G. Ligabue di Venezia - Autori: Seggi, Linda; Trabucco, Raffaella Proprietà: Fondazione Musei Civici di Venezia - CC BY-NC
Italy, Veneto, in vico Giazza Prov. Ver. 1855
as Bilimbia arnoldi Kremp.