Contents:
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    Preface  ........................   1
    Introduction  ...................   3
    Voorwoord  .....................   27
    Inleiding  .....................   30
 1. Lithops Aucampiae ...............  50
 2. Lithops Bella ...................  54
 3. Lithops Brevis ..................  57
 4. Lithops Bromfieldii .............  59
 5. Lithops Chrysocephala ...........  61
 6. Lithops Comptonii ...............  64
 7. Lithops Dendritica ..............  66
 8. Lithops Dinteri .................  68
 9. Lithops Divergens ...............  71
10. Lithops Dorotheae  ..............  73
11. Lithops Eberlanzii ..............  75
12. Lithops Erniana .................  77
13. Lithops Franciscii ..............  78
14. Lithops Fulleri .................  81
15. Lithops Fulviceps ...............  83
16. Lithops Geyeri ..................  85
17. Lithops Gracilidelineata ........  86
18. Lithops Gulielmi ................  88
19. Lithops Helmuti .................  90
20. Lithops Herrei ..................  92
21. Lithops Inae ....................  94
22. Lithops Insularis ...............  97
23. Lithops Julii ...................  99
24. Lithops Karasmontana ............ 102
25. Lithops Kuibisensis ............. 105
26. Lithops Kunjasensis ............. 106
27. Lithops Lesliei ................. 107
28. Lithops Lineata ................. 111
29. Lithops Marginata ............... 112
30. Lithops Marmorata ............... 113
31. Lithops Marthae ................. 115
32. Lithops Mennellii ............... 118
33. Lithops Meyeri .................. 120
34. Lithops Nelii ................... 121
35. Lithops Olivacea ................ 122
36. Lithops Optica .................. 125
37. Lithops Otzeniana ............... 128
38. Lithops Pseudotruncatella ....... 131
39. Lithops Ruschiorum .............. 134
40. Lithops Salicola ................ 138
41. Lithops Schwantesii ............. 140
42. Lithops Terricolor .............. 142
43. Lithops Triebneri ............... 147
44. Lithops Turbiniformis ........... 150
45. Lithops Urikosensis ............. 153
46. Lithops Vallis-Mariae ........... 154
47. Lithops van Zylii ............... 156
48. Lithops Venteri ................. 157
49. Lithops Verruculosa ............. 160
50. Lithops Weberi .................. 162