Mycotaxon 28, 1: 249 (1987).

Basionym: Parmelia duboscqii var. perreticulata Räsänen, Ann. Bot. Soc. Zool.-Bot. Fenn. Vanamo 20, 3: 3 (1944). But according to Adler & Ahti (1996: 434) "Räsänen in Sbarbaro, Ann. Mus. Civico Storia Nat. Genova 41: 40 (1941)".

Protolog: Data lacking.

Protolog type data: Data lacking.

Type locality: Italy, Liguria, Spotorno, La Torre, silicicola, 1a, 35, C. Sbarbaro (GB 98116 - holotype). Italy, Liguria, Spotorno, 'Chisenefrega' (=chi se ne frega, indicating that the exact place is not known), December 1936, C. Sbarbaro (Gyelnik: Lichenotheca parva 72); H - epitype selected here; S, US - isoepitypes).

Type locality coordinates: 44°14'0"N, 8°25'0"E; 44.233333°, 8.416667°.

Molecular barcode: Data lacking.

Thallus: 5-10 cm diam., close or loosely attached to the substratum. Upper surface grey or greenish grey, strong to slightly or not scrobiculate. Lobes (1-)2-4(-8) mm wide. Pseudocyphellae laminal and marginal, punctiform, oblong or linearly elongate, sometimes raised and located on ridges of the upper surface, rarely restricted to the margins, developing into secondary soralia with farinose or granular soredia, infrequently mixed with small thick phyllidia. Medulla white. Lower surface pale buff or creamish, frequently darker below the apices. Apothecia very rare; 8-spored asci; ascospores ellipsoid, (5-)6.5-10 x (8-)10-13 µm. Pycnidia laminal, immersed; conidia short- or long-filiform, (5-)6.5-11(-15) µm long (mode of conidial length ranging from 7 to 11 µm) less than 1 µm thick; infrequently short-filiform conidia are mixed with thicker ones (1 µm) (Adler & Ahti 1996: 434).

Photobiont: Data lacking.

Chemistry: Upper cortex K+ yellow (atranorin); medulla K- C+ and KC+ pink to red (lecanoric acid) (Adler & Ahti 1996: 434).

Ecology: Saxicolous, corticolous or lignicolous.

Distribution Type: Subcosmopolitic. North- and South America, Italy, France, Poland, Australia, New Zealand.

Basionym: Data lacking.