Xanthoparmelia tinctina (Maheu & A.Gillet) Hale
Parmelia tinctina Maheu et A. Gillet, Bull. Soc. bot. fr. 72: 860 (1925).
Thallus foliose, lobate, closely attached, rosette-forming to spreading, to 6 cm diam. Lobes rather narrow, 1-2(-4) mm wide, to 4 mm long, sinuous, margins entire, black, shining. Upper surface yellowish-green becoming suffused brownish at apices, smooth, shining, moderately isidiate, maculae and soredia absent. Isidia small, simple, brown-tipped, expanded at tips, ± globose, laminal. Lower surface black, shining, smooth, with a broad, brown, naked marginal zone. Rhizines sparse, black, short, simple. Apothecia and pycnidia not seen. Chemistry: Cortex K-; medulla K+ yellow → red, C-, KC+ red, Pd+ orange. Salazinic and usnic acids.
N: Three Kings Is. S: Coastal in Otago and Fiordland. On rocks; mainly coastal and lowland.
Cosmopolitan
X. tinctina is a very constant species which is rather rare in New Zealand. It is similar to both X. australasica and X. conspersa but is distinguished from the former by the morphology of the isidia, and from the latter by the morphology of the isidia and by medullary chemistry. Isidia in X. tinctina are small, globose structures never becoming coralloid-branched, and scattered ± evenly over the upper surface.
