Bagliettoa crassiuscula (Servít) Hafellner

in Nimis & al., MycoKeys, 31: 10, 2018. Basionym: Verrucaria crassiuscula Servít - Stud. Bot. Čechoslov., 9: 78, 1948
Synonyms: Amphoridium crassum (Arnold) Servít; Bagliettoa crassa (Arnold) Cl. Roux; Thelidium crassum Arnold; Verrucaria calciseda DC. var. crassa (Arnold) Arnold; Verrucaria crassa A. Massal. 1852 non Eschw. 1833 nom.illeg.
Distribution: N - Ven (Lazzarin 2000b).
Description: Thallus crustose, endosubstratic, white to pale grey, very thick, rugulose-verrucose. Cortex (lithocortex) densely prosoplectenchymatous, of conglutinated hyphae intermingled with microcrystals; algal layer discontinuous, the photobiont cells in clusters; medulla prosoplectenchymatous, without oil cells (macrosphaeroids) in the lower part. Perithecia black, completely immersed in the rock and leaving deep pits when they fall off. Involucrellum absent; exciple subglobose to broadly pyriform, the wall black throughout, the pigment dark reddish brown, K+ dark grey-brown; hymenial gel hemiamyloid, I+ red (I+ blue at very low concentrations of I), K/I+ blue; hamathecium of periphyses in the ostiolar canal, and short periphysoids in the half upper part of the perithecial cavity; paraphyses dissolving early. Asci 8-spored, two-layered, fissitunicate, with a thin tholus reacting I-, Verrucaria-type. Ascospores 1-celled, hyaline, ellipsoid, 12-18 x 6-7 μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a taxon of the B. calciseda-group with a thick, rugulose-verrucose thallus, and ellipsoid ascospores measuring 12–18 × 6–7 μm (according to Servít even larger); the distribution is still insufficiently known.
Growth form: Crustose endolithic
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: very rare
Submediterranean belt: rare
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
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