137
VIII. SEXUAL REPRODUCTION. 163
IX. POLYMORPHISM. 182
X. INFLUENCES AND EFFECTS. 209
XI. HABITATS. 233
XII. CULTIVATION. 253
XIII. GEOGRAPHICAL DISTRIBUTION. 266
XIV. COLLECTION AND PRESERVATION. 287
INDEX. 295

LIST OF ILLUSTRATIONS.

FIG. PAGE
1. Agaric in Process of Growth. 17
2. Section of Common Mushroom. 21
3. Sterile cells, Basidia, Cystidium, from _Gomphidius_. 21
4. _Polyporus giganteus_ (reduced). 23
5. _Hydnum repandum._ 24
6. _Calocera viscosa._ 24
7. _Tremella mesenterica._ 24
8. Basidia and spores of _Phallus_. 28
9. Basidia and spores of _Lycoperdon_. 29
10. Threads of _Trichia_. 31
11. _Arcyria incarnata_, with portion of threads and spore. 33
12. _Diachaea elegans._ 34
13. _Cyathus vernicosus._ 34
14. _Cyathus_, Sporangia and spores. 35
15. _Asterosporium Hoffmanni._ 36
16. Barren Cysts and Pseudospores of _Lecythea_. 36
17. _Coleosporium Tussilaginis._ 36
18. _Melampsora salicina_, pseudospores of 36
19. _Cystopus candidus_, conidia of 38
20. _Xenodochus carbonarius_, pseudospore. 38
21. _Phragmidium bulbosum_, pseudospores. 38
22. Pseudospores of _Puccinia_. 40
23. _Thecaphora hyalina_, pseudospores. 41
24. _AEcidium Berberidis_, peridia of 41
25. _Helminthosporium molle_, threads and spores. 42
26. _