Peltigera nana Vain.
P. dolichorhiza var. nana (Vainio) Murray, T.R.S.N.Z. (Bot.) 88: 394 (1960).
Thallus as for P. dolichorhiza but much thinner in texture, with upper surface plicate-ridged following pattern of venation below, pale greyish-green to dark red-brown. Lower surface whitish, veins narrow, 0.1-0.5 mm, raised, pale to dark red-brown. Rhizines simple, 2-3 mm long, rarely to 8 or 10 mm, pale buff to dark brown, rarely subfasciculate, with an anchoring squarrose tuft. Apothecia on ascending marginal lobules, round or ellipsoid to reflexed, disc red-brown to dark brown-black. Ascospores fusiform-acicular, pale yellowish, 3-5-septate 50-65 × 3-4 µm. Chemistry: TLC nil.
N: North Auckland (Little Barrier I.) to Wellington. S: Westland (Greymouth) to Fiordland (Doubtful Sound), coastal Otago (near Dunedin). St: (Port William, Freshwater Valley).
Western Pacific
P. nana is distinguished from P. dolichorhiza by the thinner texture (about half the Thallus thickness of P. dolichorhiza (P. nana is 100-200 µm thick, while P. dolichorhiza is 220-400 µm thick), the narrower, reddish-brown veins and rhizines on the lower surface and no terpenes in the medulla (P. dolichorhiza has a range of 2-5 terpenes).
