Kg. 7. A portion of the albumeD, exhibiting the embryo, its surface and lateral origin, according
to Mr. Bauer. Magnified 100 diameters.
Big. R. Br. is a longitudinal section of the albumen, exhibiting R. Brown’s view of the origin,
form, and surface of the embryo.
Plate XXV.
Fig. 1. A branch of the Vitis, on which are four very young buds of Bajlcsia Arrnldi. Natural
size. Of these—
“■ (not separately figured) is merely a very slight swelling, caused by the nascent parasite, but
before its parts are distinguishable.
A. (separately figured, vertically divided, and moderately magnified), the youngest parasite
whose parts are distinguishable, deeply seated, entirely enclosed, and before its cortical
covering corresponds with it in form.
B. (in like manner separately figured, divided and magnified), in which the parasite is entirely
enclosed in its reticular covering.
C. (in l i e manner separately figured), in which the reticular covering has burst, vertically
divided and magnified.
PLATES XXVI—XXIX.
Structure of Hydnora African a.
Plate XXVI.
Eig. I . A flower of Hydnora Africana, with its very short base.
2". The same longitudinally divided. Both of the natural size.
Plate XXVII.
Eig. 1. Transverse section of a p a rt of the tube of the perianthium, to show the three-lobed
columna staminea. Moderately magnified.
2. The inner surface of one of the three lobes of the column or antheral annulus.
3. Outer surface of the same. Both magnified in the same degree with fig. 1.
4. Vertical section of a portion of one of the lobes of the columna staminea, to show the
thickness and texture of the common connective.
5. Transverse section of the same, which shows the original bilocularity of each anthera.
Both more highly magnified.
6. Grains of pollen, still more highly magnified.
7. Transverse section of the flower, to show the form and surface of the stigma (of which the
three primary divisions are opposite to the lobes of the columna staminea). Magnified in
the same degree with fig. 1.
8. A portion of the stigma, which shows its composition.
9. A transverse section about the middle of the same. Both magnified somewhat more
than figs. 2 and 3.
pja. 10. A vertical section of the stigma, showing that the divisions of its surface extend quite
through to the cavity of the ovarium, separating it into an equal number of lamellae,
from the inner terminations of which the placentae are pendulous. More highly magnified
than the preceding figures.
11. A small portion of the same, still more highly magnified.
12. A transverse section, more highly magnified than fig. 11, with its densely crowded ovula
arising from every part of its surface.
13. Three ovula more highly magnified than fig. 12, to show the pedicellus or attenuated
base and depressed or perforated apex.
Plate XXVIII.
A ripe fruit (fig. 1), with the stock (the root of the supposed Euphorbia, fig. 3) and the
decumbent angular-branched stems of the parasite, from the thickened trunk of which the
ripe fruit originates at fig. 2, and from a branch of which a very young flower-bud proceeds.
Natural size.
Plate XXIX.
Fig. 1. The same ripe fruit vertically divided, with the prostrate thickened stem of the parasite
and the root of the supposed Euphorbia, whose woody fibres and vessels appear J;o penetrate
deeply into the substance of the thickened stem. Natural size.
2. A portion of the fruit transversely divided.
3. A transverse section of one of the placentae, with the ripe seeds. Slightly magnified.
4. Two seeds, more highly magnified than fig. 3.
5. A seed, magnified in the same degree as fig. 4, and vertically divided, which exhibits
the albumen more distinctly radiating than I have ever found it.
6. A seed deprived of its outer coat.
7. The same transversely divided, which, as well as fig. 5, shows the central globular embryo-
PLATES XXX—XXXII.
(From the ‘ Linnean Transactions' vol. xvi.) See Vol. I, p. 534, &c.
F ecundation of AsclepiadejE.
PLATE XXX.
ASCLEPIAS PURPURASCENS.
Fig. 1. A branch in flower. Natural size.
2. An expanded flower, of which two of the foliola coronae and one of the anther® are
removed. Moderately magnified.
3. A front or inner view of an anthera, to show the extent of bursting, particularly with
relation to the pollen mass, of which the greater part is included in the non-dehiscent
portion. Magnified as fig. 2.