. A text-book of botany for secondary schools. Botany. 200 A TEXT-BOOK OP BOTANY. Fig. 192.—A, a sporophyll of Equiseiam, bearing sporangia beneath the shield-like top; B and C, spores, showing the unwinding of the two bands forming the outer coat. loosen and uncoil; when moistened, they close around the spore. The coiling and uncoiling movements of these bands as they are wet or dry entan- gle the spores, and they fall in clumps, a num- ber of them thus germinat- ing close to- gether. 114. Gameto- phyte. — When the spores of an Equisetum germinate they give rise to gametophytes that in all ge
. A text-book of botany for secondary schools. Botany. 200 A TEXT-BOOK OP BOTANY. Fig. 192.—A, a sporophyll of Equiseiam, bearing sporangia beneath the shield-like top; B and C, spores, showing the unwinding of the two bands forming the outer coat. loosen and uncoil; when moistened, they close around the spore. The coiling and uncoiling movements of these bands as they are wet or dry entan- gle the spores, and they fall in clumps, a num- ber of them thus germinat- ing close to- gether. 114. Gameto- phyte. — When the spores of an Equisetum germinate they give rise to gametophytes that in all general features resemble those of the ferns; that is, they are small, green thallus bodies pro- ducing antheridia and archegonia. From the oospores pro- duced in the archegonia the large sporophyte arises, with its roots, rootstock, branches, leaves, and strobili. It is evident that, although an Equisetum does not seem to resemble a fern in the least, the life-history and the character of the alternating generations are the same. CLUB-MOSSES 115. General characters.—The club-mosses often look like coarse mosses, as the name suggests. Some of the larger ones are called also ground pines, because of a cer- tain resemblance to miniature pines. They are slender branching plants, with the prostrate or erect stems com- pletely clothed with small lea^'es (Fig. 193). The larger and coarser forms are abundant in the Northern woods, the prostrate stems often trailing extensively and gi^•il'lg rise to erect branches. The more delicate forms are abundant in the tropics, and are very common in greenhouses as decorative 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 Coulter, John Merle, 1851-1928. New York, D. Appleton
Size: 2348px × 1064px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1906
