. A compendium of general botany. Plants. TISSUES AND SIMPLE ORGANS. 145 very probably indicates that they are partially dependent upon a nitrogenous food-suj)ply.' The following substances serve as food for bacteria and moulds: the carbohydrates, various organic acids, glycerin, albuminous. Fig. 85.—Haustoiium of Thesium pratense. (After Solms-Laubacli.) substances, peptone, leucin and asparagin. These substances and many others Avere used by Pasteuk, and Nageli in numerous culture-experiments. (c) SyTThbiosis. Externally symbiosis resembles parasitism in that it represents the organic union
. A compendium of general botany. Plants. TISSUES AND SIMPLE ORGANS. 145 very probably indicates that they are partially dependent upon a nitrogenous food-suj)ply.' The following substances serve as food for bacteria and moulds: the carbohydrates, various organic acids, glycerin, albuminous. Fig. 85.—Haustoiium of Thesium pratense. (After Solms-Laubacli.) substances, peptone, leucin and asparagin. These substances and many others Avere used by Pasteuk, and Nageli in numerous culture-experiments. (c) SyTThbiosis. Externally symbiosis resembles parasitism in that it represents the organic union uf one plant with another. On closer examina- tion, however, we notice a marked difference. In the definition of parasitism it was stated that the host-plant was in some way injuriously affected. In symbiosis two plants live together as in parasitism, but they mutually assist each other in their life func- tions, especially in nutrition. The term symbiosis was introduced by DE Bary in his work entitled " Die Erscheinung der Sym- biose," published m 1879. The most important example is met with in lichens (Figs. 86- 88), the true nature of which was made known by Schwendener's epoch-making researches (1860-18T0). Other important researches in the same line were carried on by Bornet, de Bary, Stahl, ' Pfeffek, 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 Westermaier, Max; Schneider, Albert, 1863-1928. New York : Wiley
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1896
