Campbell . — Studies on the Araceae, III \ 
34 7 
EXPLANATION OF FIGURES IN PLATES XIV-XVIL 
Illustrating Professor Campbell’s Studies on Araceae, III. 
PLATE XIV. 
All figures refer to Anthurium violaceum , var. leucocarpum. 
Fig. I. Longitudinal section of a young flower, showing the two-celled ovary, with the young 
ovules, ? ; the perianth is not shown ; <J, one of the four stamens. 
Fig. 2. A transverse section of a flower of about the same age as that shown in Fig. i. 
Fig. 3. Longitudinal section of a very young ovule, x about 250. 
Fig. 4. A somewhat older ovule;/., the young papillate hairs of the funiculus; ar , primary 
archesporium. 
Fig. 5. An older stage of the ovule ; the cell, is probably a tapetal cell, but may possibly 
represent a second archesporial cell; in 1 ., first ; in 2 ., second integument. 
Fig. 6. Longitudinal section of an older ovule ; the young embryo-sac contains two nuclei 
situated at its poles. 
Fig. 7. The nucellus and embryo-sac from a slightly younger ovule ; the single nucleus of the 
embryo-sac is preparing for division. Leitz, immersion, 1/16, oc. 1. 
Fig. 8. A slightly older embryo-sac; the primary nucleus has just divided; /., the tapetal (?) 
cell. Leitz, immersion, 1/16, oc. 1. 
Fig. 9. Embryo-sac with two nuclei. 
Fig. 10. Nucellus and embryo-sac, after the nuclear divisions in the embryo-sac are complete; 
five of the eight nuclei are visible in this section, x about 250. 
Fig. 11. Nucellus with a second embryo-sac, sp 2 ., containing four free nuclei ; the main sac was 
entirely normal ; a , the upper part of the sac with the egg, 0, and one synergid, sy. ; b , the chalazal 
part of the sac, showing two of the antipodal cells, and the endosperm-nucleus. Leitz, im. r / 1 6, 
oc. 1. 
Fig. 12. Two sections of the embryo-sac, shown in Fig. 10 ; sy., the two synergidae ; pn pn 
the polar nuclei ; an., the antipodal cells. 
Fig. 13. One of the antipodal cells, and the endosperm-nucleus, from a somewhat older sac. 
Fig. 14. The egg-apparatus, nearly mature. 
Fig. 15. Two sections of the egg-apparatus at the time of fertilization ; //., pollen-tube. 
Fig. 16. Lower part of the embryo-sac about the time of fertilization; the antipodals are quite 
inconspicuous, and the large endosperm-nucleus is nearly ready to divide. 
Fig. 17. Two sections through the egg-apparatus at the time of fertilization ; lying close to the 
egg , 0, was one synergid, separated from the second one, sy 2 ., by the pollen-tube, pt. The second 
synergid was much shrunken. Within the pollen-tube was a deeply staining body, t. n ., probably the 
tube nucleus, while outside were two small nuclei, <5*, <5 2 , presumably the generative nuclei. 
Leitz, im. 1/16, oc. 1. 
Fig. 18. The first division of the endosperm-nucleus. Leitz, im. 1/16, oc. 1. 
Fig. 19. Base of the embryo-sac after the completion of the first endosperm-division. The 
antipodal cells, an., are still recognizable. 
Fig. 20. An older embryo-sac. x about 250. Each of the two primary endosperm -cells has 
divided into two ; the embryo, em., is still undivided. 
PLATE XV. 
All figures refer to Anthurium violaceum , var. leucocarpum. 
Fig. 21. Embryo-sac with eight endosperm-cells ; en., two of the four basal cells ; the embryo is 
still undivided. 
Fig. 22. Section of an older ovule ; the embryo is two-celled; in 1 ., in 2 ., the ovular integuments, 
x about 100. 
B b 2 
