Australian Biological Resources Study
| Checklist of the Lichens of Australia and its Island Territories | ||
| Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References | ||
| Verrucaria nigrescens Pers. | ||
| Ann. Bot. (Usteri) 14: 36 (1795). T: Europe; n.v. | ||
| Thallus epilithic, diffuse to determinate, rimose to areolate, medium green, dark olive-green or greenish black, matt, smooth to uneven, 30–60 (–100) µm thick, usually with a black basal layer that may be seen at the edges of areolae and is continuous with a prothallus; areolae angular to rounded, plane to slightly convex, very rarely concave, 0.08–0.3 (–0.5) mm wide. Algae globose, 5–9 µm diam. Perithecia one-third to two-thirds immersed, sometimes partly overgrown by the thallus, 0.2–0.4 (–0.5) mm diam., brown-black; apex usually rounded; ostiole inconspicuous or slightly depressed. Involucrellum dimidiate or extending to exciple base level and merging with the basal layer, 30–50 µm thick. Exciple brown-black, 15–20 µm thick. Centrum 0.15–0.25 mm wide. Periphyses simple, 20–35 × 1.5–3 µm. Asci 60–85 × 16–25 µm. Ascospores narrowly to broadly ellipsoidal, 18–30 × 8–15 µm. |  |
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| Occurs predominantly on limestone in south-eastern Australia, occasionally on siliceous rocks, rarely on soil. A common lichen in western Eurasia; also in North America, North Africa and China (Hong Kong). | ||
| McCarthy (2001h) | ||
| Checklist Index |
| Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References |
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