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Aspicilia polychroma Anzi
Family: Megasporaceae
[Lecanora polychroma (Anzi) Nyl.]
Aspicilia polychroma image
Magnusson, AH. 1939. Studies on Species of Lecanora, Mainly the Aspicilia gibbosa Group. Kongl. Svenska Vetenskapsakad. Handl. 17: 34-35.

Thallus (in this exs.) uniform, 7 X 3 cm large, verrucose-areolate, very pale gray to whitish gray with a yellowish tinge, C.U.C. 210, 233, 405, KOH-, the circumference very thin, partly indistinctly radiate, sterile areolae generally +/- plane or slightly convex, but most areolae fertile, +/- verruciform, 0.3-0.6(0.8) mm thick, with generally solitary (or 2 to 3) apothecia at the top.—Cortex about 35 µ thick, somewhat opaque, exterior 5-6 µ pale yellowish-brown, no amorphous stratum.  Cells rather distinct 2-3.5 µ, moderately thin-walled.  Gonidia 7-11 µ (acc. To HUE 12-18 µ), stratum 35-50 µ, not dense, somewhat opaque.  Medulla partly opaque and with fragments from the substratum, transparent in HCl, cellular with 3.5-4.5(5) µ thin-walled cells, partly also hyphose with +/- perpendicular hyphae.

Discs of the apothecia 0.3-0.5(0.8) mm broad, De 25-40, plane, depressed, often irregular in shape and +/- pruinose, sometimes 2-3 discs confluent, chiodectonoid, margin of the verrucae very prominent, generally thick, not at all darkened.—Apothecia 200(-300) µ deep.  Exciple up to 50 µ thick at the surface and brown to a depth of 50 µ, laterally 8-12 µ broad, at the base up to 50 µ thick, distinctly cellular with 2-2.5 µ cells, I+ blue or I-, surface of exciple K-.  Hypothecium about 50 µ thick, cloudy from oil, cellular, lumina 1.5-2 µ.  Hymenium 85-110 µ high, I+ greenish-blue or brownish-yellow; upper 10-13 µ olive-brown with indistinct surface.  Paraphyses guttulate and thin-walled in HCl, generally simple, in KOH 1.5 µ at the base, moniliform at the apices with 3-3.5 µ broad, globular end-cells, next cells broadly ellipsoid.  Asci 80-90 X 17-19 µ, clavate.  Spores 8, 13-15 X 8-8.5 µ (HUE:  14-18 X 8-10 µ, ANZI: 13-20 X 10-13 µ).

Pycnidia immersed, 200 X 120 µ, ampullaceous, with 60 µ broad, brown surface to a depth of 40 µ.  Conidia 20-25 X 0.6 µ, straight [HUE: 16-20 µ, STEINER (1905): 18-26 µ, NYL. (in hb.); 20-23 X 0.5 µ].

Habitat.  On mica-schist, HCl-.

Distribtuion.  Italy.  Lombardia: Bormio, Campolungo ANZI in exs. 277. (O., R.)—Novaya Zemlya.  Matotchkin shar: Serebryanka 1921 LYNGE (O.) called L. Novae Zemliae by ZAHLBR. Resembling v. pallescens in colour.