Bryostigma lapidicola (Taylor) S.Y. Kondr. & Hur

in Kondratyuk & al., Acta bot. hung. 62, 1-2: 100, 2020. . Basionym: Lecidea lapidicola Taylor - in Mackay, Fl. Hibern. 2: 124, 1836.
Synonyms: Arthonia microsticta auct. (foliicolous specimens); Arthonia muscigena Th. Fr.; Bryostigma lapidicola (Taylor) S.Y. Kondr. & J.-S. Hur; Bryostigma muscigenum (Th. Fr.) Frisch & G. Thor; Catillaria melanobola f. frullaniae B. de Lesd.
Distribution: N - Emil (Fariselli & al. 2020). C - Tosc (Puntillo & Ottonello 1997), Umb (Ravera & al. 2011). S - Camp (CLU 17888), Bas (CLU 12498), Cal (Puntillo & Vezda 1994, Puntillo 1995, 1996, Puntillo & Ottonello 1997, Puntillo & Puntillo 2004), Si (CLU 12700).
Description: Thallus crustose, endosubstratic or thinly episubstratic, olive-grey to olive-brown, thin, filmy or minutely granular, usually forming <5 mm wide patches, sometimes poorly evident. Apothecia arthonioid, black, epruinose, glossy, 0.1-0.3 mm across, slightly constricted at base, with a strongly and irregularly convex disc, without a distinct proper margin. Epithecium pale green-brown or red-brown, K+ greenish; hymenium colourless or pale green, 25-30 μm high; paraphysoids very scanty, 0.5-1 μm thick, brown-capped, especially towards apices distinctly oriented horizontally; hypothecium red-brown, 30-70 μm high, K+ olive-brown. Asci 8-spored, clavate, semi-fissitunicate, the apex broad and rounded, very thick-walled. Ascospores 1-septate, hyaline, ovoid to clavate, 8-12(-14) x 2.5-4(-5) μm, often with a slightly pointed end, thick-walled. Pycnidia rare, with a pale brown, K+ olive wall. Conidia bacilliform, 3-4 x c. 0.5 μm. Photobiont chlorococcoid, the cells 6-14(-17) μm wide. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a species with a strongly reduced thallus containing a chlorococcoid photobiont, and minute hemispherical ascomata, sometimes confused with Arthonia apatetica; it grows on the bark of deciduous trees, but also on epiphytic bryophytes (e.g. Leucodon sciuroides), on evergreen leaves in humid forests, and sometimes on siliceous rock; it is widespread, but it was probably often overlooked in Italy. All of the Italian samples are foliicolous, but the species should be looked for also on mosses, especially in the Alps. According to Cannon & al. (2020), the type of B. lapidicola has recently been found to represent an earlier name for Arthonia muscigena. The combination of A. lapidicola into Bryostigma made by Kondratyuk & al. (2020) was based on sequences identified as A. lapidicola by Frisch & al. (2014), but which are actually referable to A. fusca. For other details see Sérusiaux (1996) and Cannon & al. (2020). It is included in the Italian red list of epiphytic lichens as “Vulnerable” (Nascimbene & al. 2013c).
Growth form: Crustose
Substrata: bark and leaves
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Restricted to humid-warm, oceanic areas

Commonnes-rarity: (info)

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

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

Domenico Puntillo CC BY-SA 4.0

Domenico Puntillo; Owner: Domenico Puntillo

Felix Schumm - CC BY-SA 4.0
[ABL78054a], Brazil, Mato Grosso do Sul, Campo Grande, campus UFMS, on living leaves. 20°30’ S, 43°37’ W, 550 m. Leg. A. Aptroot (no 78054a), 23.11.2018, det. A. Aptroot, 2018