Department of the Environment and Water Resources home page

About us | Contact us | Publications | What's new

Header imagesHeader imagesHeader images

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.
  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

This work is copyright. Apart from any use as permitted under the Copyright Act 1968, no part may be reproduced by any process without prior written permission from Australian Biological Resources Study. Requests and inquiries concerning reproduction and rights should be addressed in the first instance to Dr P. McCarthy. These pages may not be displayed on, or downloaded to, any other server without the express permission of ABRS.

Top | About us | Advanced search | Contact us | Information services | Publications | Site index | What's new