. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 241 In the common blue mould, Penicillium, these erect hyphae are broom like (Fig. 152, B) and the spores are formed from the tips of the branches very much after the manner of the budding of the yeast cells. The tip of a branch buds out into a spherical cell that is finally cut off from the stalk, thus forming the spore (Fig. 152, C). This process is repeated again and again just. Fig. 151. Other common forms of the Spheriales: ^, habit of Hysterio- graphium, on a dead twig. B, ascocarps enlarged. C, ascus enlarged, show- ing c
. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 241 In the common blue mould, Penicillium, these erect hyphae are broom like (Fig. 152, B) and the spores are formed from the tips of the branches very much after the manner of the budding of the yeast cells. The tip of a branch buds out into a spherical cell that is finally cut off from the stalk, thus forming the spore (Fig. 152, C). This process is repeated again and again just. Fig. 151. Other common forms of the Spheriales: ^, habit of Hysterio- graphium, on a dead twig. B, ascocarps enlarged. C, ascus enlarged, show- ing character of ascospores. D, Daldinia. E, section of the same, showing that the stroma forms a concentric stratum of ascocarps, as, each year. F, Xylaria. G, the same with branch cut off to show the layer of ascocarps on the periphery of the stroma. below each successive spore and in this way chains of spores are formed. It will be noticed that many single spores are found instead of a large sporangium which contains many spores as in the case of Mucor. These spores are sometimes regarded as sporangia which have become reduced in size and contain but a single spore. In Aspergillus, a fungus common upon preserves and upon herbarium plants that have not been sufhciently dried, the spores are developed from very short branches that arise from a bulbous swelling at the apex of the erect hyphae (Fig. 152, A). The color of the spores, as in Mucor, is the cause of the characteristic blue or brown color of the fungi. These ex-. 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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