. The essentials of botany. Botany. 182 BOTAh'Y. found which much resemble them and contain other sup- posed reproductive bodies. 332. No sexual organs have as yet been observed. Pos- sibly they exist in the dense tissues of the knot, and fertil- ization may occur in the spring or early summer, but they. Fig. 104.—Structure of Black Knot. 1, filaments bearing conidia; 3, sty- lospores; 3, a hollow papilla (perithecium) containing spore-sacs ; 4, spore- sacs and spores, witli three slender filaments (paraphyses); 5, a spore; 6, spores germinating. All much magnified. have probably disappeared t
. The essentials of botany. Botany. 182 BOTAh'Y. found which much resemble them and contain other sup- posed reproductive bodies. 332. No sexual organs have as yet been observed. Pos- sibly they exist in the dense tissues of the knot, and fertil- ization may occur in the spring or early summer, but they. Fig. 104.—Structure of Black Knot. 1, filaments bearing conidia; 3, sty- lospores; 3, a hollow papilla (perithecium) containing spore-sacs ; 4, spore- sacs and spores, witli three slender filaments (paraphyses); 5, a spore; 6, spores germinating. All much magnified. have probably disappeared through the excessive para- sitism of these plants. 333. The parasitic filaments of each year's knot gener- ally penetrate downward some centimetres into the unin- jured bark, and remain dormant there until the following spring, when they begin the growth which results in the production of a new knot, as described above. 334. To this order belongs the Ergot (a common para- site upon heads of rye), and also many of the black growths upon the bark and wood of trees. Many species produce black spots upon living leaves, while many others occur upon dead leaves and twigs. 335. The Black Fungi include a large number of exceed-. 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 Bessey, Charles E. (Charles Edwin), 1845-1915. New York : Holt
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1896
