Flora of New Zealand Series

Holotype: New Zealand. Wellington, on bark of trees, J. Buchanan s.n. – GLAM. Isotypes – ?BM, ?CHR, ?WELT

Description : Flora (1985: 586).

N: Wellington. Known only from the type collection.

Endemic

Tremotylium occultum is characterised by: the corticolous habit; the immersed or depressed, urceolate, brown plane to subconcave apothecia that are oblong to elongate or radiate, and hidden by a thick cerebriform thalline margin; and large, brown, muriform ascospores, 60–80 × 30–32 μm.