. Plants; a text-book of botany. Botany. 86 PLANT STEUCTUEES the food which they manufacture. The less chlorophyll is used the less is it developed, and a green plant which is obtaining the larger amount of its food in a saprophytic or parasitic way is on the way to losing all of its chlorophyll and becoming a com- plete saprophyte or parasite. Certain of the low- er Algffi are in the habit of living in the body cavities of high- er plants, finding in such situations the moisture and protec- tion which they need. They may thus have brought within their reach some of the organic products of the
. Plants; a text-book of botany. Botany. 86 PLANT STEUCTUEES the food which they manufacture. The less chlorophyll is used the less is it developed, and a green plant which is obtaining the larger amount of its food in a saprophytic or parasitic way is on the way to losing all of its chlorophyll and becoming a com- plete saprophyte or parasite. Certain of the low- er Algffi are in the habit of living in the body cavities of high- er plants, finding in such situations the moisture and protec- tion which they need. They may thus have brought within their reach some of the organic products of the higher plant. If they can use some of these, as is very like- ly, a partially para- sitic habit is begun, which may lead to loss of chlorophyll and complete para- sitism. 58. Symbionts. — The phenomenon of symbiosis has already Lichens (§ 53). In any sort of drpcnd-. FlG. 75. A dodder plant parasitic on a willow twig. Tlie leaflL'tsy dodder twines al)Out the willow, and sends out sucking processes which penetrate and ahsorh.—After Steasburgeb. been referred to in connection with its broadest sense the word includes ence between living organisms, from the vine and the tree. 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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