ADULT ANATOMY OF WELWITSCHIA MIRABILIS. 353 
Fig. 6. Young seedling in which the hypocotyl is unusually short, the feeder being still present 
immediately beneath the swollen portion. The two leaves of the seedling were contiguous by 
their adjacent faces and the cotyledonary buds were very minute. Letters as in fig. 4b. For 
description see text, pp. 343-4. 
7. Young plant with widely diverging cotyledonary buds, each surrounded by a separate inner 
ridge. Between the two buds is seen the structure A, which is described in the text, p. 332. 
8a. Top of a young plant with unfused cotyledonary buds seen from above. One leaf has been 
removed, the other is torn and part of it only is present. his part (p°) is in an abnormal 
position, between the two cotyledonary buds. In fig. 8 5; drawn from a side view of the plant, 
the whole of the base of this abnormal leaf is visible, and it is seen that, while half of it is 
situated in the leaf-groove (G,), the other half passes round one of the cotyledonary buds and 
takes its origin from the groove separating the two buds. The other half of the “ leaf- 
groove ” (G5) is unoccupied by any portion of the leaf. B;, B, = extra lobes of the crown, 
originating from the base of the groove, outside the leaf. The ridge (Br) round the left lobe 
of the crown is unusually well developed and is zoned. 
9a. Top of a plant seen from above. All trace of the original separate development of the two 
lobes of the crown is lost, except for some indications of the line of fusion seen at F. 
Indentations at O, O' still afford evidence of the double origin of the two ridges. A young 
inflorescence is seen, 
96. Same plant, seen from the side. A portion of the lower ridge has been removed, in order 
to show clearly the origin of the young inflorescence from the inner ridge. 
10 a. Transverse section through structure a in fig. 7, taken about halfway between its base and 
apex. F= fibres; L = cells with lignified walls. x 116. 
10. Ditto, higher up than 10 a, showing fully developed group of fibres. x 116. 
1l. Diagram of section through young inflorescence and inner ridge in fig. 9a. Shows origin of 
inflorescence from base of pit, supplied by several vascular bundles. B — section through 
brown upper portion of the crown. x 2. 
246. (See explanation to Plate 35.) 
PLATE 35, 
- 12. Transverse section of minute hair-like lateral rootlet, from seedling grown in the Cambridge 
University Botanic Garden. B = decayed cortex, &c. ; C = corky cells ; P — phloem ; X — 
xylem. x 170. Uh 
13. Part of longitudinal section through similar but older rootlet. F, F = thick-walled unlignified 
fibres; P — sieve-tube ; A = xylem. x 170. ; 
l4. Part of longitudinal section of main root. Pxy = protoxylem ; C = tracheid separated from 
the protoxylem by two layers of parenchyma. x 170. 
15a. Transverse section through concentric ring of bundles at the 
outgrowth (the ridge primordium) shown at R in Pl. 34. fig. 1. 
bases of the cotyledons. x 116. 
15 ð. Transverse section of the other similar outgrowth on the same plant. X 116. 
16. Transverse section not far from the top of the outer ridge of the plant shown in Pl. 34. fig. x 
Tr = transfusion-tissue at the common endings of the bundles of the two series ; F = fibres; 
St = stomata; C = corky tissue. X 50. | 
17. Transverse section of young cotyledonary bud in Pl. 34. fig. 2, 
of vascular bundles. C = cork ; A, a’, a" end in a common concen 
4second ditto. x 170. 
base of small protuberant 
C = point of junction of the 
showing elongated series 
tric bundle; B and b' in 
