LIST of TEXT ILL USTRA TIONS and PLA TES 



Frontispiece. — The development of Odontoglossum iv 



Fig. 1. — Longitudinal section through mycothallus of P^//ia ^/>i/'/i;y//a .. 18 



Fig. 2. — Mycorrhizae in Piniis virginiana 27 



Fig. 3. — Mycorrhizae in Sugar Maple, Acer saccharum 32 



Fig. 4. — Renewed growth of mycorrhiza-bearing mother-root of Pinus 



Strobus 82 



Fig. 5. — Section through an older mycothallus of Botrychium obliqimm 94 



Fig. 6. — Portion of mycothallus of Lycopodium obscumm shown in sec- 

 tion 96 



Fig. 7. — Longitudinal section through apex of a mycorrhiza of Pinus 



rigida 120 



Fig. 8. — Renewed growth of a mycorrhiza of Pinus virginiana 122 



Fig. 9. — Cross-section of an ectotrophic mycorrhiza of Qucrcus montana 124 



Fig. 10. — Cross-section of endotrophic mycorrhiza of Acer Negundo. . . . 126 



Fig. 11. — Section of a mycorrhiza of Abies balsamea 133 



Fig. 12. — Portion of a cross-section of the ectendotrophic mycorrhiza of 



Cornus florida 166 



Fig. 13. — Portion of a section through mycorrhiza of Abies balsamea. . . . 168 



Fig. 14. — A cell from mycorrhiza of Allium sphacrocephalus 170 



Fig. is. — Portion of a longitudinal section through a mycorrhiza of 



Pteridium aquilinum 171 



Fig. 16. — Some cells from mycorrhizal cortex of Fraxinus americana. . . 173 



Pl. 1. — One of the earliest illustrations of mycotrophic infection, by 



Edouasd Prillieux, 1856 209 



Pl. 2. — Mycorrhizae in Scot's Pine, Pinus sylvestris 210 



Pl. 3. — Mycorrhizae of Car pinus betulus and Fagus sylvatica 211 



Pl. 4. — Effect of mycorrhizae on plant growth 213 



Pl. 5. — Photomicrograph of a portion of a fossil mycorrhizome of Sclero- 



pteris illinoiensis 215 



