20 INDUCTION, DEVELOPMENT, AND HERITABILITY OF FASCIATIONS. 
DESCRIPTION OF PLATE V. 
(Drawn with an Abbé camera lucida and reduced to one-third of given magnifications. | 
FIGS 1, 2,3. Transverse sections of stems of O. diennzs. Successive stagesin the early 
development of a groove-fasciation. Meristem, 7, thick-walled parenchyma, 
pp; medullary parenchyma, 7%; cambium, c, outer phloem of primary bundle 
ring, ##,,; inner phloem of same ring, pZ,._ Fig. 1 shows the lowest section of 
the meristem (plate Iv, fig. 1@). The dark shading in the meristem indicates 
intercellular secretions. At x the cambium has been destroyed. X 430. 
Fic. 2. Drawing of meristems in plate 1v, fig. 1d. Two meristems (7,, #,) appear in the 
break in the ring. X 430. 
Fic. 3. Drawing of two groups of secondary bundles, showing first differentiation of 
vessels, Secondary bundle-groups, 4,, 4. X 560. 
Fic. 4. O. cructata. Diagram of longitudinal section of a cylindrical protuberance. 
Bundle-ring, 4, callus, cZ; cortex, cr. X 25. 
Fic. 5. O. cructata The same as fig. 4. Group of callus cells from the apex. X 360. 
Fic. 6. O. cruciata. The same as figs. 4and 5. Drawing of portion of apex of bundle- 
ae opposite point marked z in fig. 4. Spiral ducts run transversely across 
the tip. 
Fic. 7. O. cruciata. Diagram of longitudinal section of apex of plant shown in fig. 8. 
Sections of vegetative circle, vc, callus, cZ; primary bundle ring, d. xX 18%. 
Fic. 8. O. cructata. Longitudinal section of apex of fig. 7 at c/. Callus, c/; proto- 
phloem, £4,, £/,, proto-xylem showing spiral ducts, xy. This is an early 
stage in the formation of a protuberance. X 360. 
FIG. 9. O. cruciata. Diagram of cross-section of base of fasciated rosette which shows 
traces of injury. The oval shape of the pith shows the beginning of the 
flattening. Phellogen, dg, bark, 62; meristems in pith, #, callus at point of 
inhibition of growth, cl. xX 8. 
Fic. 10. O. cruciata. Diagram of longitudinal section of bifurcated tip, showing posi- 
tion of callus, c/, At g the bundle-elements run irregularly in a confused 
tangle. A is a small protuberance. X 52. 
Fic. 11. O. cruciata. Drawing of longitudinal section of apex similar to fig. 13. An 
incision surrounded by hypertrophy and meristematic divisions. The con- 
tents of the cavity are stained reddish purple. X 560. 
Fic. 12. O. cruciata. The same as fig. 11. Cells in pith surrounding the lower end of 
incision. The blackened edges indicate purplish discoloration between the 
cells. The cells hypertrophy and close in around the incision without dividing. 
xX 480. 
Fic. 13. O. cruciata. Diagrammatic longitudinal section of an injured tip similar to the 
one pictured in figs. 11 and 12. The apex seems to be slightly fasciated, and 
the stem is bifurcated. 7, injury. X 25. 
Fic. 14. O. cruciata. Transverse section of early stage of ring-fasciation. The inter- 
cellular conditions indicate that it has been injured. Cf fig. 12. 7, two cells 
of the meristem. X 560. 
FiG.15. O. cructata. Transverse sections of ring-fasciation in fig. 14 at a more advanced 
stage. Secondary bundle-ring, 4,,. In the center of the pith is a cavity sur- 
rounded by hypertrophied cells and meristematic divisions. This is not the 
beginning of the lysigenous cavity of the ring, which occurs some sections 
above. X 430. 
Fic. 16. Transverse section of flowering stem just below the point of fasciation, showing 
inhibition in the formation of wood at rr. X 25. 
Fic. 17. Raimannia odorata. Cross-section of young bifuricated rosette, showing injury 
to cortex and inhibition in the development of the bundle-ring at rx. X 92. 
