Flora of New Zealand Series

≡Verrucaria glabrata var. homalisma C.Knight, Trans. Linn. Soc. 23: 100 (1860).

Lectotype: New Zealand. Sine loco [probably Auckland], Charles Knight 269 – BM [fide Galloway (1985a: 491)].

Description : Flora (1985: 491).

N: Auckland, known only from the type collection.

Endemic

Illustration : Knight (1860: pl. XI, fig. 9 – as Verrucaria glabrata var. homalisma).

Pyrenula homalisma is characterised by: the corticolous habit; the dark olivaceous-brown, matt to slightly glossy thallus in darkish bands or patches, 2–8 cm diam., not delimited by a marginal prothallus; numerous, prominent, emergent, flattened-applanate, perithecia, solitary to 4–6-confluent, with gaping ostioles, often with radiating cracks; and broadly ovoid, 3-septate ascospores, (18.5–)22–24(–25.5) × (8–)10–12 μm.