. Textbook of botany. Botany. ROOTS AND THEIR USES l8i new suckers are formed from time to time, which, Hke the sucker formed in the first season, grow inward through the tissues of the host until they reach the wood. Thus, while the suckers of the dodder take materials both from the bast and from the wood, the suckers of the mistletoe make con- nection only with the wood of the host, whence they absorb water and simple salts. Having green leaves, the mistletoe takes carbon dioxid from the air and manufactures for itself the more complex foods which the dodder takes from the host plant. The Am
. Textbook of botany. Botany. ROOTS AND THEIR USES l8i new suckers are formed from time to time, which, Hke the sucker formed in the first season, grow inward through the tissues of the host until they reach the wood. Thus, while the suckers of the dodder take materials both from the bast and from the wood, the suckers of the mistletoe make con- nection only with the wood of the host, whence they absorb water and simple salts. Having green leaves, the mistletoe takes carbon dioxid from the air and manufactures for itself the more complex foods which the dodder takes from the host plant. The American mistletoes are similar to the European form in their manner of growth and of obtaining food, but are smaller plants. One of them is also used, though less ex- tensively, for Christmas decora- tions. Among the most remarkable parasitic plants are the Rafflesias and their relatives (Fig. 113). Their vegetative body consists Fig- 113-— One of the Raf- only of a network of thread-like ^^^'\ ^^'"''^ {Brusmansia), growing as a parasite on the rows of cells, very much like the roots of Cissus. After Kemer. body of a fungus; this network lives and grows between the bark and the wood of prostrate stems and roots. The only part of the parasite that appears outside the tissues of the host is the large flower. That of one species of Rafflesia, found in Stimatra, is said to be the largest flower borne by any plant. When fully open, it has a diameter of three feet. 202. Mycorhizas. — A curious relation exists between many forest trees, including oaks, maples, poplars, and most of the conifers, and certain fungi whose branching threads are found living upon small branch roots of the trees. The fungous threads form a thick felt over the surface of a root; separate threads grow in between the cells of the cortex, and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these ill
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1917
