Lepraria incana (L.) Ach.
Byssus incanus L., Sp. Pl.: 1169 (1753).
Thallus white, greenish-grey or glaucous-grey, forming a rather thick, soft, uneven crust in which the mycobiont may be in part dominant, to thinly granular, spreading in irregular patches 0.5-3(-5) cm diam. Chemistry: Atranorin, zeorin, stictic, constictic and norstictic (tr.) acids.
Cosmopolitan
N: North Auckland (Lat. 35° S) to Wellington. S: Nelson (Lake Rotoroa) to Southland (Lake Hauroko). St: (Glory Cove). On bark, clay banks, soil in rock crevices or beneath rock overhangs, or on rocks (both acidic and basic). Although mainly lowland and coastal (tree fern caudices are a favoured habitat) it is known from some subalpine habitats to 1600 m, east of the Main Divide. In shaded, forest habitats specimens are glaucous-green and granular-floccose, spreading irregularly over the substrate, while in exposed habitats on rock, thalli may become ± placodioid at margins forming ± concentric rings, dying centrally.
