Common - but really difficult to collect. Saxicolous on gabbro and serpentinite rubble in pohutukawa (Metrosideros excelsa) / tawapou (Planchonella costata) / karaka (Corynocarpus laevigatus) coastl forest. Associated with Parmotrema tinctorum.
Medulla K+ brownish yellow; thallus large (300 mm diameter), greenish grey when moist, greyish white when dry, smooth, without reticulate cracking, very faintly white-maculate near lobe margins, lobe margins virtually glabrous, but sparsely ciliate in lobe axils and sinuses; soredia not seen; lower surface with broad, smooth, naked pale brown margin, otherwise more or less densely rhizinate, rhizines simple, black.
Images taken from wetted specimen.
Voucher collected (figured here)
Shield lichen on a sandstone with other kinds of lichen too!
on granite rock
on kowhai tree
The Parmeliaceae is a large and diverse family of Lecanoromycetes. With over 2000 species in roughly 87 genera, it is regarded as the largest family of lichen forming fungi. The most speciose genera in the family are the well-known groups: Xanthoparmelia (800+ species), Usnea (500+ species), Parmotrema (350+ species), and Hypotrachyna (190+ species).