MORPHOLOGY OF PHYLLOGLOSSUM DRUMMONDII. 
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Fig. 4. A small piece of epidermis of the tuber, showing under higher power the 
thickened, stratified walls, with pits as described in text, (x 325.) 
Fig. 5. Median longitudinal section of the base of a young tuber. (X 325.) 
Fig. 6. Median longitudinal section of the apex of a mature tuber. (X 130.) 
Fig. 7. Apex of mature tuber as seen from above. ( X 325.) 
Fig. 8. Apex of a very small tuber, after germination for fifteen days. ^=the first, 
and in this case the only leaf. «=apex of new tuber. (X 20.) 
Fig. 9. A similar specimen more advanced. Zj=first leaf, £=new tuber, a=apex 
of new tuber, r=root. (X20.) 
Fig. 10. Apex of tuber germinated for thirteen days, showing a rather unusual dis¬ 
position of parts, viz., two leaves of equal size (l), apex of new tuber (a), 
and a small outgrowth (/ ?), which may be a young leaf. (X 20.) A, seen 
from above ; B, lateral view. 
Fig. 11. Apex of tuber germinated thirteen days: li —first leaf, 4=pair of subsequent 
leaves, a=apex of new tuber. (X20.) A, seen from above; B, lateral 
view. 
Fig. 12. Apex of a similar tuber germinated ten days. (X20.) 
Fig. 13. Apex of a strong tuber which has, on germination, formed a first leaf (li), 
and two subsequent pairs (4), (ha), n—apex of new tuber. (x20.) 
Fig. 14. Apex of a strong tuber after germination thirteen days : l=th.e four leaves, 
a=apex of new tuber. (X20.) A, lateral view ; B, seen from above. 
Fig. 15. Outline of a median longitudinal section of a germinating plant similar to 
that represented in fig. 13. 
Fig. 16. A, frontal aspect of a plant germinated for twenty days ; B, lateral view of 
the same. r=root. (X20.) 
Fig. 17. A more advanced plant with three leaves (l), new tuber ( 4 ) with the apex 
at (a), sh= sheath. 
Fig. 18. A plant after germination for three months. 1 =ordinary leaves, l*= last 
formed smaller leaf, t x —original tuber, 4=new tuber, r=root, s/i=sheath. 
(X about 5.) 
Fig. 19. A similar plant. ( X 5.) 
Fig. 20. A plant germinated three-ancl-a-half months. Z=two leaves, in this case 
connate. (X about 5.) 
N. B.—All the figures 8-20 represent plants of purely vegetative development 
which would not produce sporangia. 
Fig. 21. A young plant seen from above, and showing two connate roots; ap— apex 
of sporangium-bearing axis, which has formed two leaves (4). (X 20 .) 
Fig. 22. Young plant germinated thirteen days, and developing a sporangium-bearing 
axis. A, as seen from above ; B, lateral aspect. (X 20.) 
Fig. 23. Y oung plant rather more advanced, showing leaves (l) and sporangium¬ 
bearing axis, but no sign of a new tuber. ( X 20.) 
MDCCCLXXXV. 4 S 
