114 Mot tier,—Chondrio somes and Primordia of Chlor op lasts, &c. 
rows of rounded granules. In each cell the chloroplasts are the larger round or elliptical bodies, 
while the chondriosomes are very small granules and delicate, slender, bacteria-like rods, x 1,250. 
Fig. 6. A cell a little farther behind the region of Fig. 5. n, nucleus; chloroplasts appear as 
rounded or elliptical bodies; the smaller rods and granules are the chondriosomes. x 1,500. 
Fig. 7. A cell older than that in Fig. 6, from beneath a dorsal air-chamber. The chloroplasts 
are mature, some showing division stages. The chondriosomes are relatively large, x 1,500. 
Fig. 8. A tangential view of an older cell, in which the chloroplasts are mainly confined to the 
thin peripheral layer of cytoplasm; they show a densely-staining shell with a colourless, lenticular 
inclusion. The chondriosomes are small, slender, homogeneous rods or granules, having, under the 
dry lens, the appearance of so many bacteria. Some of the rods appear to be composed of granules, 
x 1,500. 
Fig. 9. A young rhizoid and a few cells of the lower epidermis. In the rhizoid are seen 
numerous rods and granules and the conspicuous nucleus. Many of the rods and granules are in 
process of division. The majority, if not all, of these are chondriosomes. In the epidermal cells, 
chondriosomes and chloroplasts are seen, x 1,500. 
Fig. 10. Finns Banksiana. A cell from the cortex of the hypocotyl of a seedling 1 cm. in 
length. The chloroplasts appear round, oval, or elliptical. In some the inclusion is rounded; 
in others, lenticular. The chondriosomes are small rods and granules, x 1,500. 
Fig. 11. Chloroplasts in different stages of maturity, from the same seedling as Fig. 10. 
a, from near base of cotyledon ; the inclusions are either round or lenticular in form, two sometimes 
being present in a chloroplast; b and c, mature chloroplasts from cortex of hypocotyl. If the 
chloroplasts are crowded, they become polygonal by mutual pressure, c. Some of these mature 
chloroplasts contain two or more bodies which behave like starch inclusions; others contain only 
one inclusion as in younger chloroplasts. Between the four chloroplasts at b are shown five 
chondriosomes. At c an adult chloroplast is in process of division, x 1,500. 
Fig. 12. An apical cell of the gametophyte of Anthoceros laevis , showing nucleus, chloroplast, 
and very delicate rod-shaped chondriosomes. x 1,250. 
Fig. 13. An apical cell from the root of Adiantum pedatnm. The relatively small leucoplasts 
are chiefly lenticular in form ; the chondriosomes are rods and granules, x 1,500. 
Fig. 14. a, leucoplasts from the seventh layer of the root-cap of Adiantum ; each contains two 
or more lenticular inclusions, b, a cell of the fifth layer of the root-cap; the leucoplasts are chiefly 
lenticular; the chondriosomes are small rods and granules, x 1,500. 
Fig. 15. A cell from the central cylinder a short distance behind the apical cell in the root of 
Adiantum . The long conspicuous rods are primordia of leucoplasts; the smaller rods and granules 
are chondriosomes. x 1,500. 
Figs. 16 and 17. Parts of older elongating cells of the central cylinder of the root of Adiantum. 
In 16, at the right, is a cluster of leucoplasts with starch inclusions. The primordia of leucoplasts, 
16, 17, that did not develop into plastids are generally very long, thread-like, and flattened. These 
are undergoing disorganization. The chondriosomes are chiefly rounded granules and are present in 
countless numbers, x 1,500. 
