Flora of New Zealand Series

S. tumidulum (Knight et Mitten) Zahlbr., Cat. lich. univ. 2: 565 (1923).

Platygrapha tumidula Knight et Mitten, Trans. Linn. Soc. Lond. 23: 103 (1860).

P. constricta Krempelh., Verhandl. zool.-bot. Ges. Wien 26: 459 (1876).

Stigmatidium subtilissimum Nyl., Lich. N.Z.: 118 (1888).

Lectotype: New Zealand. Auckland, Sine loco. Charles Knight 287, 1858, BM!

Platygrapha constricta. Type: New Zealand. Sine loco (prob. Wellington). Charles Knight, M - not seen.

Stigmatidium subtilissimum. Type: New Zealand. Sine loco (prob. Wellington). Charles Knight, H-NYL - not seen.

Thallus continuous, thin, greenish-olive to pale greyish-yellow or brownish, occasionally minutely areolate-cracked, in irregular patches, 1-3 cm diam., delimited by a thin black prothallus, corticolous. Apothecia lirelline, black, raised, straight or curved, or furcate-sigmoid, 0.1-0.8 mm long and 0.5 mm wide, often slightly covered with cortex, scattered rather widely. Asci clavate with a pronounced tapering foot and apical dimple. Ascospores narrow acicular, curved, to shallow sigmoid, 25-30(-40) × 1.8-2.5 µm. Chemistry: Thamnolic acid.

N: Auckland (Knight - BM), Wellington (Knight - BM, ?M).

Endemic