Developments of the Oophyte in Trichomanes. 303 
DESCRIPTION OF FIGURES IN 
PLATES XIV, XV, AND XVI. 
Illustrating Professor Bower’s Paper on some Normal and Abnormal Developments 
of the Oophyte in Trichomanes. 
Figs. 1-22. Trichomanes pyxidiferum. 
Fig. 1. Sorus from an old frond bearing filamentous protonema. x 3. 
Fig. 2. Portion of the columella, c , bearing arrested sporangia, sp, which have 
undergone a further irregular growth. Protonema, pr , and rhizoids, r 3 have arisen by 
outgrowth of superficial cells of the columella, x 70. 
Fig. 3. A sporangium, sp, which has been arrested in its normal growth and de- 
veloped from it is an irregular growth with rhizoids, r. x 85. 
F’ig. 4. Columella, c, with arrested sporangium, sp, from which a rhizoid has 
been formed, r: the sporangium is multicellular, but the cell-divisions are not 
drawn in. x 130. 
Fig. 5. Irregular growth with rhizoids, r, from the columella, c. x 85. 
Fig. 6. Part of a section through the columella, showing outgrowth from a single 
cell, x 85. 
Fig. 7. a-d. Series illustrating intermediate steps from lateral to terminal 
position of rhizoids. x 85. 
Fig. 8. Old moniliform protonemal filaments, with fungal hyphae. x 85. 
Fig. 9. A-F, Antheridia in various stages of development. B, C, D seen in op- 
tical section. E seen laterally from outside. F seen obliquely from above. 
x, centre of the apex, x 175. 
Fig. 10. Branch of protonema (archegoniophore) bearing five archegonia of 
successive ages, a-e. x 175. 
Fig. 11. Ditto, with one archegonium. x 175. 
Fig. 12. Ditto, very young before formation of archegonia. x 175- 
Fig* 13. A protonemal filament in which apparently one cell has become par- 
titioned into a multicellular mass, on which are borne three archegonia. x 7°- 
Fig. 14. Young archegoniophore showing relation to the protonema which bears 
it. x 175. 
Fig. 15. Neck of archegonium, as seen from above after it has opened, 
x 175- 
Fig. 16 and 1 7. Archegonia showing variable number of cells composing the neck, 
x 175. 
Fig. 18. Part of old frond bearing on its under surface numerous sporophytic 
buds, x 3. 
Fig. 19. Part of transverse section of a frond showing outgrowths from single 
cells, x 70. 
Figs. 20 and 21. Such outgrowths in later stages of development, x 7°- 
Fig. 22. A similar outgrowth from frond of more advanced development, 
x 70. 
