Key TO New Zealand Nephromata

1 Algae green; thallus yellow to green or brownish, K ± Subgenus Nephroma australe

Algae blue-green; thallus shades of brown or blue, K—Subgenus Nephromium

2. Upper surface strongly foveolate-reticulate, lower bullate cellulosum 2 Surfaces smooth or weakly depressed.

3. Dark reddish-brown to grey, more or less isidiose above, 3 spores 3-septate helveticum

Brown or blue, isidia absent or confined to margins, spores 1-septate lyallii