. Plants; a text-book of botany. Botany. food supplies. Therefore, pro- cesses are devel- oped which pene- trate and absorb. The mistletoe and dodder are seed- plants "which have this habit, and both have such processes (see Figs. 102, 103). This habit is much more extensively devel- oped, however, in a low group of plants known as the fungi. ilany of these parasitic fungi live upon plants and animals, common illustrations being the mildews of lilac leaves and many other plants, the rust of wheat, the smut of corn, etc. To. Root structuie. —In the lowest groups of plants (algffi, fungi, a
. Plants; a text-book of botany. Botany. food supplies. Therefore, pro- cesses are devel- oped which pene- trate and absorb. The mistletoe and dodder are seed- plants "which have this habit, and both have such processes (see Figs. 102, 103). This habit is much more extensively devel- oped, however, in a low group of plants known as the fungi. ilany of these parasitic fungi live upon plants and animals, common illustrations being the mildews of lilac leaves and many other plants, the rust of wheat, the smut of corn, etc. To. Root structuie. —In the lowest groups of plants (algffi, fungi, and moss-plants) true roots are not formed, but very simple struc- tures, generally hair- like (see Fig. 104). In fern-plants and seed- plants, however, the root is a complex structure, so different from the root-like pro- FlG. 103. A section showing the living connection hetween dodder and a golden rod upon which it is growing. The penetrating and absorbing organ i/t) has passed through the cortex (c), the vascular zone (&), and is disorganizing the pith (p).. Fig. 104. Section through the thallus of a liver- wort iJIarcfiantia), showing the hair-like pro- cesses (rhizoids) which come from the under surface and act as roots in gripping and ab- sorbing. In the epidermis of the upper surface a chimney-like opening is seen, leading into a chamber containing cella with 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 and company
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