Anzia madagascarensis des Abb.
Thallus laciniate, loosely attached, orbicular to spreading, 1-4 cm diam., corticolous. Laciniae convex, rather narrow 0.4-0.8(-1.0) mm wide, ± dichotomously branching, margins entire, apices blunt or pointed. Upper surface pale greenish, white at margins, distinctly maculate (×10 lens), smooth, matt, occasionally transversely cracked, without isidia, pruina or soredia. Lower cortex absent. Chondroid axis of parallel, longitudinally arranged hyphae, between medulla and hypothallus, rigid, tough, 0.1-0.3 mm diam. Hypothallus black or brown-black, densely compacted, spongy, 0.5-0.8(-1.0) mm thick, continuous over whole lower surface. Rhizines stout, black, simple, 0.5-1.0 mm long with an apical, squarrose anchoring tuft. Apothecia and pycnidia not seen. Chemistry: Cortex K+ yellow; medulla K-, C-, KC-, Pd+ red. Atranorin, protocetraric and stictic acids and two unidentified xanthones.
N: North Auckland, Radar Bush. On bark of Cordyline australis. Discovered in New Zealand by J. K. Bartlett (2.1.1980).
Palaeotropical
A. madagascarensis is related to A. jamesii and in North Auckland the two species are sympatric, however, it is distinguished from the latter by lacking pruinose lobe tips and laminal isidia, and by a different chemistry.
