Thallus usually thick, rarely thin, greyish white to pale brownish grey, continuous, farinose or cracked-areolate.
Anamorph: conidiomata pycnidia, not seen in GB material. Conidia are 5-7 x ca 1 µm, and curved.
Teleomorph: apothecia rare, 0.2-1.1 mm diam., roundish to angular, or elliptical to elongate (then to 2 mm long), sometimes substellate, black, at first immersed then sessile. Disc flat to strongly domed, usually strongly white or bluish white pruinose. True exciple thin to thick, dark brown, often prominent, or becoming excluded. Exciple and hypothecium K– (not greenish). Epithecium hyaline to dark brown (K+ greenish). Hymenium 50-70 (-85) μm tall, hyaline, I+ red, with branching and anastomosing paraphyses with swollen and pigmented tips. Asci 50-75 × 11-13 μm, cylindric-clavate, thick-walled and fissitunicate, 8-spored. Ascospores 12-17 (-19) × 3-4 (-5) μm, cylindric-ellipsoidal to cylindric-fusiform, initially 3-septate, constricted at the septa and sometimes with one to three non-constricted secondary transverse septa, hyaline, smooth, thick-walled, surrounded by a thin gelatinous sheath.
Chemistry: thallus and apothecial pruina C+ red, K–, Pd–, UV– (lecanoric and gyrophoric acids and erythrin).
Assessed by Woods & Coppins (2012) as of Least Concern, but listed as Nationally Scarce.
Lecanographa grumulosa var. hemisphaerica was described with (semi-) globose apothecia with an excluded exciple; it occurs alongside the type variety and it appears that these fruit bodies arise from parasitized apothecia rather than thalli of Dirina spp. The combination into Paralecanographa has not been made, and does not appear to be necessary.
Initially parasitic on Dirina fallax and D. massiliensis, but perhaps becoming lichenized subsequently. Populations on siliceous rocks have a thin thallus with areoles and inconspicuous medulla, and those on limestone or mortar have a thick whitish thallus with a well-differentiated medulla. This is probably due to characteristics of the host lichen thallus.
Found in southern and western Britain, especially near the coast. BLS map here.
On dry ± calcareous rocks and mortar, and on siliceous rock substrata; often under sheltered overhangs and shaded walls.