Vainio, E. (1909). Lichenes in viciniis stationis hibernae expeditionis Vegae prope pagum Pitlekai in Sibiria septentrionali a Dre. E. Almquist collecti. Praefationem scripsit F. Almquist. Arkiv for Botanik, Band 8, No. 4: 11-175.
Thallus crustose, uniform, thick or moderately thick (2-0.2 millim.), verrucose or verrucose-unequal or areaolate and areoles consisting of connate verrucae, contiguous, beautifully lemon yellow, KHO-, CaCl2O2 becoming red. Apothecia commonly moderately- sized, 0.4-1.3 millim. wide, appressed, disc plane or eventually convex, black, naked, opaque, margin moderately thick, black, naked, eventually excluded. Hypothecium dark brown/grayish-brown-sooty. Spores 8, distichous, 1-septate, dark brown/grayish-brown, 0.018-0.031 millim. long, 0.011-0.012 millim. thick, membrane more unequal, moderately thick. –Thallus lacking soredia, KHO (CaCl2O2) intensely becoming red, medulla white or partly rose, I-, hypothallus indistinct. Excipulum dark brown/grayish-brown-sooty, KHO-. Hymenium c. 0.090-0.100 millim. thick, I persistently becoming blue. Epithecium dark brown/grayish-brown–sooty or becoming dark brown/grayish-brown. Paraphyses moderately lax, coherent, apices clavate. Spore septum thin, pores sometimes distinct, not clothed with a gelatinous layer. Conceptacle pycnoconidia olive-becoming dark brown/grayish-brown-sooty, immersed in thallus. Sterigmata very short, c. 0.006 millim. long, poorly articulate, top joint attenuate above. Pycnoconidia elongate or oblong, straight, apices rounded, 0.004-0.006 millim. long, 0.001-0.0015 millim. thick.—L. perlutescens Nyl. (subviridescens) thallus CaCl2O2 slightly orange and pycnoconidia 0.003 millim. long, 0.0015 millim. thick, according to Nyl., l.c., differs, and collected attached to rock, according to orginal specimen in mus. Fenn. Habit is similar to hidden plants Almquist collected.