ILLUSTRATIONS. 
PLATES. 
Frontisprece. Cladonia alpestris (L.) Rabenh. Facing page. 
Piate 1. Calicium polyporaeum Nyl. and Opegrapha varia Pers........------- 48 
2. Graphis scripta (L.) Ach. and Arthonia radiata (Pers.) Ach.......-.+-- 54 
3. Conotrema urceolatum (Ach.) Tuck. ...-...-------- 20s sees ee eee eee 63 
4, Lecidea melancheima Tuck ........-.----- 2-22 ee ee eee eee eee eee ee 67 
5. Lecitea granulosa (Hoffm.) Ach. and Bacidia rubella (Hofim.) Mass. .. 70 
6. Lecidea speirea Ach. and L. albocaerulescens (Wulf.) Schaer...... 78 
7. Megalospora sanguinaria (L.) Koerb .....-------- 81 
8. Rhizocarpon calcareum concentricum (Dav.) Th. Fr. and " Rhizocarpon 
geographicum (Li.) Lam......---++-- 02-2222 e eee eee eee eee ee 100 
9. Psora russellit (Tuck.) Fink......-...-----.- 22-220 e eee ee eee eee eee 101 
10. Baeomyces byssoides (L.) Ach. and Icmadophila aeruginosa (Scop.) 
Mass..... 22.02 e eee ee eee ee eee eee eee eee e nent ceneeees 105 
11. Cladonia pyxidata (L.) Hoffm...........---------------- ++ +--+ wee. 107 
12. Cladonia rangiferina (L.) Web...........2---+-2---+-2- +2 2-22-22 2-- +> 111 
13. Cladonia alpestris (L.) Rabenh...........-------+-+-+----+--+-+----- 112 
14. Cladonia bacillaris (Del.) Nyl. and C. fimbriata coniocraea (Iloerke) 
Wainio........2.-.--- 2-2 e eee eee eee ee ee ee ee ee ee eee cece eens 112 
15. Cladonia deformis (L.) Hoffm..........------------- +--+ +--+ ++ ... 114 
16. Subspecies of Cladonia furcata (Huds.) Schrad wee cee eee cece cece eeee 117 
17. Cladonia pyxidata chlorophaea (Spreng.) Floerke.........-.----- -.-. 18 
18. Stereocaulon coralloides Fr........--------02--- 22 eee e cece rece 131 
19. Stereocaulon tomentosum Fr.....-------.--- 220222 eee ee eee eee eee eee 131 
20. Synechoblastus nigrescens (Huds.) Stitzenb. and Ephebe pubescens 
(L. ) Fri cece ee eee eee nents 135 
21. Collema pulposum (Bernh.) Ach........----------------+-+-+-+--- 136 
22. Leptogiwm tremelloides (L.) 8. F. Gray....-.-------------+-+++----- 139 
23. Pyrenopsis polycocca (Nyl.) Tuck. and Solorina saccata (L.) Ach... -. 144 
24, Ephebe pubescens (L.) Fr.....--------- +++ 222022 eee eee eee eee eee 147 
25. Pannaria leucosticta Tuck........--.-.----------- 2-2 eee eee eee eee 152 
26. Cyphelle............02-- ee eee eee eee eee eee eens ... 154 
27. Species of Sticta, Parmelia, Pyxine, etc., in a cedar swamp......... 155 
28. Sticta scrobiculata (Scop.) Ach.......--..---------+--++- we eeeeeesee 157 
29. Cephalodia of Peltigera aphthosa (L.) Willd.........----------------- 159 
30. Peltigera aphthosa (L.) Willd........-..------------+-e eee eee eee 160 
31. Gyrophora hyperborea Ach..........--------------0-e2ee eee: ceeeeee 167 
32. An Acarospora.......2..02.2 eee ee ee eee eee ee eee eee ee cece ee eeeeeeeee 170 
33. Lecanora muralis versicolor (Pers.) Tuck.......-..-.-------------+--- 175 
34. Lecanora hagent Ach. and Pertusaria velata (Turn.) Nyl...-..------- 179 
35. Parmelia perlata (L.) Ach.......-.--------- 20222 e eee eee eee eee eee 191 
36. Parmelia tiliacea (Hoffm.) Ach. and Cetraria juniperina pinastri (Scop.) 
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