Atti Ist. Ven. Sc. Lett. Arti, ser. 3, 5: 315, 1860. Basionym: Platygramma hutchinsiae Leight. - Ann. Mag. Nat. Hist., ser. 2, 13: 393, 1854.
Synonyms: Chiodecton hutchinsiae (Leight.) Zahlbr.; Enterographa germanica (A. Massal.) A. Massal.; Enterographa venosa sensu Culberson; Opegrapha hutchinsiae (Leight.) Körb.; Opegrapha umbrosa O. Behr; Stigmatidium germanicum A. Massal.; Stigmatidium hutchinsiae (Leight.) Nyl.
Distribution: C - Tosc.
Description: Thallus crustose, thinly episubstratic, continuous or finely rimose, dark grey, olive-green or olive-brown, delimited by a black prothallus and often forming mosaics. Apothecia lirelliform, simple and comma-like or most often branched, 0.2-1 x 0.08-0.2(-0.3) mm, black or brown-black, immersed in the thallus, with a flat to slightly convex disc, without a distinct proper margin, often surrounded by a whitish cryptothalline margin. Proper exciple much reduced, brown, often poorly evident; epithecium brown ot brown-black, non-granular, K-; hymenium colourless, I+ reddish; paraphysoids branched and anastomosing, thread-like, 0.8-1 μm thick, the apical cells hardly swollen; hyothecium colourless. Asci 8-spored, cylindrical, fissitunicate, with an amyloid endoascus and a K/I+ blue ring-structure surrounding a small ocular chamber. Ascospores 4-6(-8)-septate, hyaline, spindle-shaped, straight or curved, (22-)24-28(-32) x 4-5 μm. Pycnidia black, immersed. Conidia rod-shaped, 5-6 x 1-1.5 μm. Photobiont trentepohlioid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: confluentic acid.
Note: a mild-temperate to humid subtropical lichen found on vertical to underhanging surfaces of hard siliceous rocks, rarely on smooth bark, at low elevations; to be looked for further in Tyrrhenian Italy.