Biology of Fegotella conic a. 119 
Vochting, H. (’85) : Ueber die Regeneration der Marchantieen. Jahrb. fur wiss. Bot., Bd. xvi; 
separate ed. of forty-eight pages. 
Voigt, A. (79) : Ein Beitrag zur vergleichenden Anatomie der Marchantiaceen. Bot. Zeitung, 
Jahrg. xxxvii ; separate ed. of nineteen pages. 
Zimmermann, A. (79) : Ueber die Einwirkung des Lichtes auf den Marchantieenthallus. Arb. d. 
bot. Inst, in Wurzburg, Bd. ii, Heft 4. 
EXPLANATION OF FIGURES IN PLATES VI, VII. 
Illustrating Mr. Cavers’ Paper on Fegatella conica. 
The drawings for Figs. 32 and 33 (PI. VII) were kindly made for the author by Miss Lucy M. 
Phillips. 
Fig. 1. Surface view of anterior portion of thallus, from above, showing the areolation of 
the surface ; each area has in its centre a pore situated on the summit of a dome-like elevation ; the 
growing-point lies in the notch at the margin of the thallus, and is covered by the overlapping 
appendages of the ventral scales, x 12. 
Fig. 2. Similar view, showing a new shoot arising in the notch at the anterior end of the 
thallus. x 4. 
Figs. 3-7. Successive stages in the growth of a winter-shoot, x 1. 
Fig. 8. Horizontal section of thallus, showing the transverse row of initial-cells (x, x, x ) : 
v.s. ventral scales, x 360. 
Fig. 9. Similar section, showing dichotomy of apex : x, x, the initial-cells of the two new 
growing-points ; v. s. ventral scales, x 360. 
Fig. 10. Surface view of a pore, showing the concentric rows of cells, and the granular 
rim immediately bounding the pore, x 360. 
Fig. 11. Vertical longitudinal section of thallus, showing an air-chamber, lined by chlorophyll- 
bearing filaments, those below the wide pore being produced into long hyaline processes : ep. epi- 
dermis, forming roof of chamber ; st. starch-grains in cells underlying chamber, x 360. 
Figs. 12-15. Stages in development of ventral scale, in surface view: p. p. primary papilla; 
app. appendage ; b. sh. basal portion of scale, in the axil of which spring tuberculate rhizoids (rh.), 
whilst its free margin bears mucilage-hairs (m. k.). x 200. 
Fig. 16. Fully grown ventral scale ; lettering as in Fig. 15. x 15. 
Fig. 17. Part of transverse section of thallus: a. c. air-chambers; lam. part of lamina; 
m. 0. mucilage-organ ; sm. rk. smooth-walled rhizoids ; tub. rh. tuberculate rhizoids, borne in 
bundles in the axils of the ventral scales (v. s.). x 75. 
Fig. 18. Vertical longitudinal section through growing-point of thallus : a. c. developing 
air-chambers ; ep. epidermis ; m. 0. mucilage-organ ; p. pores ; v. s. ventral scales ; x. initial 
cell, x 360. 
Fig. 19. Cells in ventral tissue of midrib, containing Nostoc-chains. x 360. 
Fig. 20. Part of a longitudinal section through midrib, traversing a row of mucilage-cells. 
X 360. 
Fig. 21. Cells in ventral tissue of lamina, showing pitted walls: 0. b. oil-body, x 360. 
Fig. 22. Part of a longitudinal section of midrib, showing cells of the ventral tissue traversed by 
branching fungal hyphae. x 360. 
Fig. 23. Cell with fungal hyphae bearing thin-walled vesicles ( ves .). x 540. 
Fig. 24. Cell with fungal hyphae, one of which bears a large terminal thick- walled vesicle (m.). 
x 54°. 
Fig. 25. Branched ends of two smooth-walled rhizoids. x 120. 
Fig. 26. Two young rhizoids, with nuclei and protoplasm, x 200. 
Fig. 27. Transverse sections of tuberculate rhizoids, showing the peg-like thickenings, x 360. 
