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182 DAVID J. GALLOWAY<br />

554-560; Sticta 561-567; Parmelia 568-624; Borrera 625-641; Cetraria 642-651; Peltidea<br />

652-665; Nephroma 666-669; Dufourea 670-672; Cenomyce 673-756; Baeomyces 757-760;<br />

Isidium 761-767; Stereocaulon 768-773; Sphaerophoron 774-775; Rhizomorpha 776-777;<br />

Alectoria 778-788; Ramalina 789-811; Cornicularia 812-825; Usnea 826-839; Collema 840<br />

-883 \Lepraria 884-894.<br />

The lichens are attached to water-marked paper glued on to card, 11-12 x 7-8 cm and are<br />

named in ink by Acharius (Fig. 17). They are housed in packets mounted on herbarium sheets<br />

and enclosed in folders in the order stated in Acharius's catalogue. Tibell (1987: 258) has<br />

recently commented on the BM-ACH collection as follows '. . . specimens seem first to have<br />

been annotated according to Methodus Lichenum, and when the annotations were revised<br />

"mscr." (manuscript) and "Lichenogr. universal." were added. The "mscr." has been crossed<br />

out, possibly by Acharius himself after finishing the Methodus and Lichenographia universalis<br />

manuscripts. The drawback of the BM-ACH material is that no information on collectors or<br />

localities is supplied with the specimens. Its importance arises from the fact that this was<br />

probably part of the material Acharius was working with when he wrote the "Methodus" and<br />

"Lichenographia".' This view was stated by Swartz in letters to Turner (see p. 168 above) when<br />

he wrote that Acharius had spent a year preparing a named set of lichens '. . . which will be the<br />

truest and surest guide to his Methodus' (Swartz, 1806c).<br />

William Borrer (1781-1862) saw the Acharius lichens snortly after their arrival at the Linnean<br />

Society, examined them carefully and prepared manuscript comments on them dated 25 May<br />

1809 and 22 November 1811 (Fig. 18). These comments are maintained with the Acharius<br />

catalogue in BM-ACH.<br />

J. R. Laundon (BM) has prepared a detailed list of the BM-ACH collection including several<br />

additional taxa not included in the Acharius holograph catalogue. The full BM-ACH holding is<br />

shown in Table 1 .<br />

Table 1 Arrangement of lichens in BM-ACH.<br />

Spiloma<br />

1. tumidulum<br />

2. v. rubrum<br />

3. melaleucum<br />

4. v. leucopellaeum<br />

5. mlcroclonum<br />

6. leucostigma<br />

7. paradoxum<br />

8. xanthostigma<br />

9. humosum<br />

10. Verrucaria<br />

11. maculans var. substellatum<br />

12. vitiligo<br />

- versicolorvar. variolosum<br />

Arthonia<br />

12a. punctiformis<br />

13. v. olivacea<br />

14. pruinosa<br />

15 . gibberulosa<br />

16. Swartziana<br />

17. v. cinerascens<br />

18. lurida<br />

19. gyrosa<br />

20. radiata<br />

21. v. astroidea<br />

22. v. tynnocarpa<br />

23. v. stellulatus<br />

24. v. hyparcha<br />

25. v. anastomosans<br />

26. melantera<br />

27. lyncea<br />

Solorina<br />

28. crocea<br />

29. saccata<br />

Gyalecta<br />

30. epulotica<br />

31. geoica<br />

31a. Wahlenbergiana<br />

32. v. truncigena<br />

33. atrata<br />

Lecidea<br />

34. immersa<br />

35 . pantosticta<br />

36. v. polyblasta<br />

37. v. spilota<br />

38. v. viridana<br />

39. antillarum<br />

40. petraea<br />

41. \.excentrica<br />

42. v. callistea<br />

43. v. obscurata<br />

44. v. globulata

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