50 
Plate V. 
13,14. Surface view of abnormal tissue showing distortion of stomata ; a, guard 
cells; b, accessory cells; c, epidermal cell. 
15. Cross-section of cells of abnormal ground tissue in region of active growth, 
showing nucleii. 
16. Cross-section of the same a little nearer the periphery nucleii not so con¬ 
spicuous, and are not represented. 
17. Cross-section of the same still nearer the periphery. 
Plate VI. 
18. Cross-section of the same near the periphery with a, the epidermal cells. 
19. Cross-section of a distorted bundle ; a, intercellular canal; b, annular ves¬ 
sel ; c, pitted duct; e, element of bundle sheath ; /, wood parenchyma. 
Plate VII. 
20. A sectiou in abnormal tissue showing a, longitudinal section of a bundle, 
also a mass of mycelium filaments in early fruiting stage. 
21. Longitudinal section of a more typical abnormal bundle; a, branch of 
the bundle. 
22. Cross section of the abnormal bundle. 
23. Mycelium filament. 
24. Mycelium filaments running through cells of the ground tissue. 
25. Early stage of spore formation. 
26: Later stage of spore formation. • 
27. Mature spore. 
— — .01 mm , scale to which the figures are drawn. 
Plate VIII. 
Fig. 1. Upper surface of pileus of ALucronoporus tomentosus, Fr. 
2. Lower surface of same. 
3. Section of pores showing the projecting points or spines. 
4. One of these spines more highly magnified. 
5. Spine w r ith a bifid tip. 
o 
