. Botany for agricultural students . Botany. 376 THALLOPHYTES. substratum, and sends up conidiophores at the ends of which the conidia are borne in radiating chains as shown in Figure 326. The spores are scattered mostly by the wind. The sex organs appear a little later than the conidia and consist of two short hyphal filaments which come together and intertwine spirally. One of these filaments represents the oogo- nium and the other, the antheridium. After fertilization, ascogenous hyphae develop from the ascogonium and bear eight-spored asci at their tips. In the meantime other hyphae grow u
. Botany for agricultural students . Botany. 376 THALLOPHYTES. substratum, and sends up conidiophores at the ends of which the conidia are borne in radiating chains as shown in Figure 326. The spores are scattered mostly by the wind. The sex organs appear a little later than the conidia and consist of two short hyphal filaments which come together and intertwine spirally. One of these filaments represents the oogo- nium and the other, the antheridium. After fertilization, ascogenous hyphae develop from the ascogonium and bear eight-spored asci at their tips. In the meantime other hyphae grow up from below the ascogonium and a closed case or cleistothecium is formed, within which are the asci inter- mingled amongst sterile hyphae. The walls of the asci finally dissolve, thus setting the asco- spores free within the cleistothecium. Through the decay of the wall of the cleistothecium the spores are finally freed to be scattered by the wind. Another Ascomycete which sometimes poisons livestock is the Purple Monascus. It belongs to another order and is a simpler Ascomycete than Aspergillus. It is often present in moldy silage and when fed to live- stock may cause death. This mold produces a purple pigment which colors the substratum upon which the mold lives and distinctly colors silage attacked by the Mold. Penicillium. — A common species of Penicillium is the Blue Mold which develops on shoes or gloves left in damp places, and on lemons, cheese, etc. It often occurs intermingled with Bread Mold on bread. The conidia are borne as shown in Figure 327. Its sexual reproduction is similar to that of Aspergillus and the cleistothecia are about as large as a coarse grain of sand. Fia. 327. — A species of Penicillium, showing conidi- ophores bearing chains of 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 or
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
