Volume 4

An arrangement of British plants; according to the latest improvements of the Linnaean system. To which is prefixed, An easy introduction to the study of botany. Illustrated by copper plates / by William Withering, M.D. F.R.S. member of the Royal Academy of Sciences at Lisbon; Fellow of the Linnæan Society; honorary member of the Royal Medical Society at Edinburgh, &c.

  • William Withering
Date:
1796
Catalogue details

Licence: Public Domain Mark

Credit: An arrangement of British plants; according to the latest improvements of the Linnaean system. To which is prefixed, An easy introduction to the study of botany. Illustrated by copper plates / by William Withering, M.D. F.R.S. member of the Royal Academy of Sciences at Lisbon; Fellow of the Linnæan Society; honorary member of the Royal Medical Society at Edinburgh, &c. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

    21/452 (page 9)
    with Tubercles. Rocks, England. Dicks, g.—Scotland. Dr. J. E. Smith. [Garreg wen, on limestone rocks; not common. Mr. Griffith.] Var. 3. Tubercles globular; crust grey white. Lich. pilularis, (which see.) Var. 4. Crust rough, brown, much cracked; tubercles flat topped. Onstonesupon Bettvfs mountain, Denbighsh. Mr. Griffith.] Var 5. Fructifications saucer-like, changing to large black tubercles; crust brown, granulated; granulations large, resem- bling: tubercles. Specimen from Mr. Griffith; growing on Schistus. The crust has a pale brown outer coat, which within has a greenish cast, covering a white matter which forms the principal substance of the crust. It is granulated and cracked on the surface; the granulations large, somewhat elevated, and not unlike tubercles. The fructifications are at first like saucers with a brown border; this soon disappears, and they rise up in the form of large black nearly globular tubercles. This curious specimen seems to shew that the Lichens confluent and pilularis are the same plant under somewhat different circum- stances of growth. Mr. Griffith also suggests, that our 4th var. may be the L. pinnatus of Dickson, which I think probable, and is, as he observes, the plant in its oldest and most weather-beaten State. Var. 6. Crust brown, changing to black. In this instance the black colour of the fructifications seems to extend itself over the otherwise brown crust. Tubercles gently convex, border brown black. They are white within, and the crust greenish underneath, as in the 5th variety. Found by Mr. Griffith on stones and walls near Bettws mountain, and near Garthewyn, Denbighshire. L, Tubercles very black, crowded : crust whitish with a canes'cens. glaucous tinge, spreading, rather leaf-like at the edge. Dicks.2.5-DiU. 18.17. A. Crust circular, 1 to 2 inches diameter, prefsed to, hoary, wrinkled, lobed, resembling small leaves cohering together, sprinkled in the centre with mealy globules. Saucers small, nu- merous in the centre, the margin blunt, of the colour of the disk. Being rarely found with saucers, it has been supposed to belong to the L. pallescens. Dickson. Has nothing in common with L. pallescens. Mr. Woodward. Crust adhering very closely to the bark of trees, and the sides of walls, in circularpatche