Lecanora kohu

Lecanora kohu has a crustose thallus, is greenish-white when fresh (drying to a pale yellow/cream colour), and has no soredia or isidia. The species has areoles with irregular-crenate margins measuring 0.25–0.5 mm (0.0098–0.0197 in) in length. It is similar in morphology to Lecanora symmicta, from which it is distinguished by the continuous, areolate thallus, immersed apothecia with pale pink to pink-brown discs, and by the presence of atranorin and psoromic acid rather than usnic acid, zeorin and xanthones in the thallus.

The species is endemic to New Zealand, currently only known to occur in New Zealand in the Chatham Islands, though is likely present in other locations. The species primarily grows on the bark of a variety of plants, primarily on Olearia traversiorum and Coprosma chathamica, and is also found on Muehlenbeckia, Melicytus chathamicus, Myrsine chathamica, Dracophyllum arboreum, Cordyline australis and Plagianthus regius subsp. chathamicus.

The species is strictly corticolous (growing on bark) and photophilous, preferring to live on isolated trees exposed to the sun, or trees and shrubs found on forest margins. The species is tolerant to strong wind, and can be the dominant crustose lichen present in wind-swept open areas of the Chatham Islands, such as coastal margins and open dunes.