Bactrospora patellarioides (Nyl.) Almq. var. patellarioides

Skandin. Artern Schismatomma, Opegrapha och Bactrospora: 24, 1869. Basionym: Lecidea patellarioides Nyl. - Mém. Soc. Sc. Nat. Cherbourg, 2: 333, 1854.
Synonyms: Lecanactis patellarioides (Nyl.) Vain.
Distribution: N - Piem (Giordani & Malaspina 2016), Lig (Giordani & al. 2002, Brunialti & Giordani 2003, Giordani & Incerti 2008). C - Tosc (Laganà & al. 2002, Stofer 2006), Laz (Bartoli & al. 1997, Stofer 2006), Sar. S - Camp (Nimis & Tretiach 2004, Garofalo & al. 2010), Pugl (Durini & Medagli 2002, 2004), Cal (Puntillo 1996, Incerti & Nimis 2006), Si (Nimis & al. 1994, Grillo & Carfì 1997, Grillo 1998, Grillo & al. 2002, Grillo & Caniglia 2004).
Description: Thallus crustose, episubstratic, continuous to rimose, white, creamy white or pale brownish grey, smooth to farinose, ecorticate, with a thick epinecral layer filled with crystals, sometimes delimited by a thin dark prothallus. Apothecia lecideine, black, adnate to sessile, round to slightly irregular in outline, (0.2-)0.4-0.8(-1.2) mm across, with a slightly concave to slightly convex, epruinose disc, and a thin, smooth, rarely finally excluded proper margin. Proper exciple orange brown to dark brown, not extending below the hymenium; epithecium dark reddish brown, granulose; hymenium colourless to pale brown, (65-)110-170 µm high, I+ pale red, K/I+ pale blue; paraphysoids richly branched in upper part, not coherent, c. 1.5 µm thick at base, the apical cells up to 4 µm wide; hypothecium colourless to pale yellowish brown in lower part. Asci (6-)8-spored, clavate to subcylindrical, the wall slightly thickened at top at maturity, I+ yellowish brown, the apical dome K/I+ blue, with a K/I- central area. Ascospores 9-17(-25)-septate, acicular or cylindrical, straight or slightly curved, (42-)60-120 x 2-3.5(-5) µm. Pycnidia semi-immersed, the wall brown in upper part, colourless at base. Conidia cylindrical, slightly curved, 8-14 x c. 1 µm. Photobiont trentepohlioid. Spot tests: thallus K-, KC-, C-, P-, UV-. Chemistry: without lichen substances.
Note: a mild-temperate to humid subtropical, Mediterranean-Atlantic lichen found on acid bark of mature, isolated, mostly broad-leaved trees, especially Quercus and Olea, occasionally on siliceous rocks, often near the coast in Tyrrhenian Italy. Some records could refer to var. convexa.
Growth form: Crustose
Substrata: bark
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)
In underhangs rarely wetted by rain

Commonnes-rarity: (info)

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

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

P.L. Nimis CC BY-SA 04
TSB 12724

P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (38165)

Domenico Puntillo; Owner: Domenico Puntillo

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (12724)