APPENDIX. 
Tue Orders, genera and species described below had already 
been published by Crombie in his Monograph, Part 1, before the 
preparation of Part 2, in which they should have rightly been 
placed, was undertaken. The modern views of affinity accepted 
by lichenological students have necessitated the classification 
adopted. These Orders were left unnumbered in Part 2; but it 
is now possible to indicate the numerical arrangement, not only 
of those described here (marked by an asterisk), but of the 
remaining Orders of Subseries III. Graphidinex, and of Series IT. 
Pyrenocarpez, included in Part 2, to which references are 
duly given. 
The completed list is as follows :— 
Subseries II. CYCLOCARPINEA—continued from p. 26. 
Order *XVI. GyropHorace®, Part 2, p. 2; described in whole. 
*X VII. Craponiaces, Part 2, p. 2; described in whole. 
XVIII. CoENnogontaces#, Part 2, p. 2. 
*XITX. Lecipeaces, Part 2, p. 4; described in part. 
Subseries II]. GRAPHIDINEZ:. 
(Tribe XIX. GrapuipeE!, Part 2, p. 200.) 
Order *XX. Dririnacez, Part 2, p. 200; described in whole. 
*XXT. RocceLLaces, Part 2, p. 200; described in whole, 
XXII. Lecanactracea, Part 2, p. 201. 
XXIII. Arrnoniaces, Part 2, p. 205. 
XXIV. GraPHIDAced#, Part 2, p. 220. 
XXV. CuiopecTonace®, Part 2, p. 258. 
