Blastodesmia nitida A. Massal.

Ric. Auton. Lich. Crost.: 180, 1852.
Synonyms: Arthopyrenia pluriseptata (Nyl.) Arnold non auct.; Polyblastia nitida (A. Massal.) Trevis.; Pyrenula circumfusa (Nyl.) Trevis.; Verrucaria circumfusa Nyl.; Verrucaria massalongii Garov.
Distribution: N - VG, Frl, Ven (Lazzarin 2000b), TAA (Nascimbene & al. 2007b), Lomb, Emil (Fariselli & al. 2020). C - Tosc, Laz, Abr (Nimis & Tretiach 1999, Caporale & al. 2016). S - Si.
Description: Thallus crustose, endosubstratic, not lichenized, forming pale patches of 1-2 cm diam. on the bark. Perithecia 0.4-0.6 mm across, half-immersed, the visble part protruding, hemispherical, black, shiny, sometimes depressed near the ostiole. Perithecial wall dark throughout; paraphyses filiform, simple, free, soon disappearing. Asci 8-spored, cylindrical-clavate. Ascospores 5-9-septate, brown, rounded at apices, with rectangular cells, the central cell larger, (24-)28-37(-47) x 6-10(-12) µm. Pycnidia black, immersed. Conidia colourless, straight, 3-5 x 0.5 µm. Spot tests: all negative. Chemistry: no lichen substances.
Note: a typically submediterranean early coloniser of smooth bark, especially of Fraxinus ornus, doubtfully lichenised.
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)
Pioneer species

Commonnes-rarity: (info)

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

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

Domenico Puntillo; Owner: Domenico Puntillo

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (25225)

Source: Keissler K. von 1938. Pyrenulaceae, Mycoporaceae, Coniocarpineae. In: Rabenhorst G L: Kryptogamen-Flora von Deutschland, Österreich und der Schweiz. 2nd, IX, Die Flechten, Abt. 1, 2. Gebr. Borntraeger, Leipzig, pp. 1-846.