Flora of New Zealand Series

P. crassescens (Stirton) Müll. Arg., Bull. Herb. Boissier 2, App. 1: 95 (1894).

Verrucaria crassescens Stirton, Proc. phil. Soc. Glasg. 10: 303 (1877).

Stigmatidium confluens Knight, T.N.Z.I. 15: 353 (1883).

S. prominulum Knight, T.N.Z.I. 16: 405 (1884).

Verrucaria subpunctella Nyl., Lich. N.Z.: 131 (1888).

Lectotype: New Zealand. Near Wellington. J. Buchanan 19/74, GLAM!

Stigmatidium confluens. Lectotype: New Zealand. ?Wellington. Charles Knight, WELT, Herb. Knight, Vol. 64A, p. 25!

Stigmatidium prominulum. Lectotype: New Zealand. ?Wellington. Charles Knight, BM!

Verrucaria subpunctella. Isotype: New Zealand. Wellington. Charles Knight, BM!

Thallus corticate, continuous, olive-green to yellowish-green or buff, matt or shining, dimpled, minutely plicate in parts, rarely irregularly cracked. Perithecia immersed, scattered, solitary, visible as hemispherical dimples entirely covered by cortex. Ostiole pale, apical, punctiform. Perithecial cavity 0.2-1.0 mm wide, involucrellum 20-60 µm thick, carbonised. Ascospores ovoid to broadly ellipsoid with pointed ends, ± lemon-shaped, 4-locular, the central two locules largest, rounded, (20-)22.1-26 × 10.2-12(-14) µm. Chemistry: Yellow pigment UV+ quench.

N: Known only from the type collection but probably more widely distributed.

Endemic