. Beginners' botany. Botany. CHAPTER XXIII PHENOGAMS AND CRYPTOGAMS The plants thus far studied produce flowers; and the flowers produce seeds by means of which the plant is prop- agated. There are other plants, however, that produce no seeds, and these plants (including bac- teria) are probably more numer- ous than the seed-bearing plants. These plants propagate by means of spores, which are generative cells, •usually simple, containing no em- bryo. These spores are very small, and sometimes are not visible to the naked Fig. 254. —Christmas Fern. — Dryopteris acrostichoides; known also
. Beginners' botany. Botany. CHAPTER XXIII PHENOGAMS AND CRYPTOGAMS The plants thus far studied produce flowers; and the flowers produce seeds by means of which the plant is prop- agated. There are other plants, however, that produce no seeds, and these plants (including bac- teria) are probably more numer- ous than the seed-bearing plants. These plants propagate by means of spores, which are generative cells, •usually simple, containing no em- bryo. These spores are very small, and sometimes are not visible to the naked Fig. 254. —Christmas Fern. — Dryopteris acrostichoides; known also as Aspidium. Prominent among the spore- propagated plants are ferns. The common Christmas fern (so called because it remains green during winter) is shown in Fig. 254. The plant has no trunk. The leaves spring directly from the ground. The leaves of ferns are called fronds. They vary in shape, as other leaves do. Some of the fronds in Fig. 254 are seen to be narrower at the top. If these are examined more closely (Fig. 255), 176. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bailey, L. H. (Liberty Hyde), 1858-1954. New York, The Macmillan company
Size: 1632px × 1530px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
