Johnson . — On Arceuthobium Oxycedri. 159 
EXPLANATION OF FIGURES IN PLATE X. A. 
Illustrating Mr. Johnson’s paper on Arceuthobium Oxycedri. 
Fig. 1. Longitudinal section of pollinated female flower, through the median 
plane of the perianth-segments, p. s. perianth-segment with vascular bundle. 
s. c. style and stylar canal, formed by the two carpels. o.p. ovarian papilla. 
e. s. embryo-sacs, x 120. 
Fig. 2. Ovarian papilla of Fig. 1. e. s. embryo-sac, a vacuole in each. 
0. oosphere. p. t. pollen-tube, penetrating into apex of papilla, ep. p. epidermis 
of papilla. Only the egg-apparatus in e. s. is fully figured, x 1020. 
Fig. 3. Embryo-sac, a little younger than in Fig. 2, and from a section of 
the flower made at right angles to the median plane of the perianth -segments. 
0. oosphere. a. c. antipodal cells, x 1020. 
Fig. 4. Longitudinal section of the 1 ovule.’ p. t. primary tapetum cell divided 
e. s. uninucleate embryo-sac. s. c. two sister-cells of embryo-sac. x 480. 
Fig. 5. Longitudinal section of ovarian papilla showing embryo-sac in same 
stage as Fig. 4. 0. p. ovarian papilla, e. s. embryo-sac. i. w. 0. inner surface 
of wall of ovary between which and the papilla is the cavity, x 480. 
Fig. 6. Transverse section of a female flower through the ovarian papilla. 
e. s. the two embryo-sacs opposite the ‘ fused ’ perianth-segments, v . b. vascular 
bundle of p. s. the perianth-segment, o.p. ovarian papilla, x 120. 
Fig. 7. Transverse section of female flower through the style to show the two 
carpels opposite the two perianth-lobes, c. the carpel, s. c. the stylar canal. 
p. s. perianth-segment, x 120. 
Fig. 8. Ripe fruit in surface view. a. the zone of dehiscence, b. the line of 
separation between the sclerotic cells of the mesocarp {a . . b) and the ordinary 
parenchyma of the pericarp. The dotted lines indicate the stalk of the fruit enclosed 
in a pair of scaly leaves, x 12. 
Fig. 9. The same fruit in section, endm. endosperm, emb. embryo, v. s. viscid 
cells of endocarp. m. c. crushed cells of mesocarp. x 14. 
Fig. 10. Longitudinal section of an ejected seed. endp. inner part of endocarp. 
a. 0 . p. apical part of ovarian papilla, b. 0. p. basal part of ovarian papilla. 
v. c. viscid cells now open at outer ends. emb. embryo, endm. endosperm, x 120. 
Fig. 11. A little of the basal part of the pericarp dotted line at a in Fig. 9. 
s. m. c. sclerotic cells of mesocarp. a. the meristematic zone at the base of the 
fruit, endm. endosperm, x 480. 
Fig. 12. Apical part of viscid cells in longitudinal section, showing connection 
with the crushed mesocarp-cells, m. c. p. v. c , dilated peripheral end of viscid 
cell. m'. c'. uncrushed mesocarp-cells. 1 . c. line of cleavage of viscid cells at 
ejection of seed, x 1020. 
Fig. 13- Longitudinal section through two stamens of male flower just before 
expansion, p. s. perianth-segment, st. stamen, v. b. vascular bundle. 
