cover

John W. Thomson:

The Lichen Genus Physcia in North America

1963. 172 pages, 25 plates, 37 Distribution maps, 17x24cm, 400 g
Language: English

(Nova Hedwigia, Beihefte, Beih. 7)

ISBN 978-3-768-25407-6, paperback

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Contents

Synopsis top ↑

As is so often the case in taxonomy, an attempt to understand the species collected for other work leads to the need for a revision of a genus in one’s area. The difficulty of dealing with the North American material of the very common genus Plysica has led to the present attempt to understand its species and their variations. In this study the author has been much helped and influenced by the recent European papers on the genus by Lynge (1935, 1916); Schade (1938); DuRietz (1925); Nadvornik (1947, 1948); and MaasGeesteranus (1952). The North American papers of Degelius (1940, 1941) also aided in interpretations. The bulk of the information in this paper is based on the examination of over 10,000 packets of Physica in the major herbaria of North America.

Table of Contents top ↑

Introduction 1
History of the Genus Physcia 3
Morphology 5
Chemistry 8
Geographical Distribution 9
Phylogeny 12
Artificial Key to the North American Species of Physcia 16
Systematic Treatment 23
Family Physciaceae 23
Genus Physcia (Schreb.) DC 23
Key to the Groups of Physcia 24
Subgenus Euphyscia T. Fr. 24
Section Macrosperma (Vainio) MaasG. 25
1. Physcia syncolla Tuck 25
2. Physcia elaeina (Sm.) A. L. Sm. 28
3. Physcia minor (Fée) Vainio 30
Section Brachysperma Vainio em. MaasG 31
Subsection Albida (Vainio) Thoms. 31
Group Tenella (Lynge) Thoms. 31
4. Physcia leptalea (Ach.) DC. 32
5. Physcia adscendens (E. Fr.) Oliv. em. Bitt. 33
6. Physcia tenella (Scop.) DC. em. Bitt. 38
7. Physcia subobscura (Nyl.) Nyl. 39
Group Stellaris (Lynge) Thoms. 41
8. Physcia mexicana B. de Lesd. 42
9. Physcia bi^iana (Mass.) A. Zahlbr. 43
10. Physcia aipolia (Ehrh.) Hampe. 44
11. Physcia phaea (Tuck.) Thoms. 54
12. Physcia halei Thoms. 57
13. Physcia convexa Müll. Arg. 57
14. Physcia alba (Fée) Müll. Arg. 58
15. Physcia cascadensis H. Magn. 61
16. Physcia stellaris (L.) Nyl. 61
17. Physcia albinea (Ach.) Nyl. 71
Group Astroidea (Lynge) Thoms. 72
18. Physcia dementi (Sm.) Lynge 72
Group Caesia (Lynge) Thoms. 73
19. Physcia caesia (Hoffm.) Hampe 74
20. Physcia tribacoides Nyl. 77
Group Tribacia (Lynge) Thoms. 81
21. Physcia subtilis De gel82
22. Physcia teretiuscula (Ach.) Lynge 84
23. Physcia intermedia Vainio 86
24. Physcia vainioi Räs. 87
25. Physcia albicans (Pcrs.) Thoms. 88
26. Physcia pseudospeciosa Thoms. 91
27. Physcia callosa Nyl. 91
28. Physcia dubia (Hoffm.) Lettau 93
29. Physcia t rib acia (Ach.) Nyl. 95
30. Physcia millegrana Dcgcl. 95
Subsection Sordulenta (Vainio) Thoms. 102
Group Obscura (Lyngc) Thoms. 102
31. Physcia constipât a (Nyl.) Norrl. & Nyl. 103
32. Physcia setosa (Ach.) Nyl. 105
33. Physcia leana Tuck. 106
34. Physcia lacinulata Müll. Arg. 107
35. Physcia ciliata (Hoffm.) DR. 108
36. Physcia endococcinea (Kocrb) T. Fr. 116
37. Physcia nigricans (Flk.) Stiz. cm. DR. 118
38. Physcia orbicularis (Neck.) Poetsch 119
39. Physcia sciastra (Ach.) DR. 130
Group Pulverulenta (Lyngc) Thoms. 132
40. Physcia pulverulenta (Schreb.) Hampe 133
41. Physcia muscigena (Ach.) Nyl. 139
42. Physcia grisea (Lam.) A. Zahlbr. 144
Subgenus Hypomelaena (Trev.) Vainio. 157
43. Physcia aegialita (Ach.) Nyl. 158
44. Physcia purpurascens Vainio 160
45. Physcia aspera H. Magn. 161
46. Physcia picta (S\v.) Nyl. 162
47. Physcia frostii (Tuck.) A. Zahlbr. 164
Doubtful and excluded species. 166
References 167
Index 168