Heterodea muelleri
Sticta muelleri Hampe, Linnaea 25: 711 (1852).
Thallus foliose, becoming erect or spreading, irregular in shape, to 10 cm wide and 4 cm tall. Lobes 6-10 mm wide, ascending and recurved at margins. Upper surface smooth, matt or slightly shining, yellow-green to yellow-brown (usnic acid in cortex), without isidia, maculae, pseudocyphellae or soredia. Medulla white. Lower surface decorticate, densely rhizinate, rhizines brown to black, sometimes pale, with a network of dark veins, sometimes with paler depressions or spots, sometimes wholly black. Apothecia on lobe magins, 1 mm diam., disc convex pale red-brown to dark brown, margins thin often excluded. Hypothecium colourless. Hymenium to 45 µm tall including a pale brown epithecium. Paraphyses simple, 1.5 µm diam. Asci clavate 30-25 × 10-12 µm. Ascospores 10-12 × 4-5 µm, ellipsoid. Pycnidia marginal, stipitate, spherical, to 150 µm diam. Conidia bacillar, colourless, straight or slightly curved, 6-8 × 1 µm. Chemistry: Thallus KC+ yellow; medulla K-, C-, KC-, Pd-. Diffractaic and usnic acids.
N: North Auckland. Ninety Mile Beach, Karikari Peninsula, dune hollows, s.l. First collected by H.H. Allan and G.H. Cunningham in 1934. Rediscovered in a collection of mosses made by J.K. Bartlett (14 August 1976) on the Karikari Peninsula (lat. 34° 41 'S) near Puheke on a damp sandstone ridge in dune slacks.
Australasian
