. College botany; structure, physiology and economics of plants. Botany. 280 COLLEGE BOTANY green molds which are found on leather, fruits, vegetables, cheese and other organic materials. They produce an abundance of mycelium and numerous conidia, which are arranged in chains which radiate from a common origin. The sexual reproduction is by means of antheridia and oogonia. Fertilization is followed by the formation of an ascocarp' bearing eight-spored asci. ThegemisPenicilUum (Fig. 129) contains numerous species of blue molds which are found growing on fruits, vegetables, cheese, bread, leathe
. College botany; structure, physiology and economics of plants. Botany. 280 COLLEGE BOTANY green molds which are found on leather, fruits, vegetables, cheese and other organic materials. They produce an abundance of mycelium and numerous conidia, which are arranged in chains which radiate from a common origin. The sexual reproduction is by means of antheridia and oogonia. Fertilization is followed by the formation of an ascocarp' bearing eight-spored asci. ThegemisPenicilUum (Fig. 129) contains numerous species of blue molds which are found growing on fruits, vegetables, cheese, bread, leather and other organic materials. Some of them are very important as the causes of decay in fruits, especially oranges and lemons, while others are used for the development. Fig. 129.—Penicillium. of desirable flavors in cheese. Their reproduction is very similar to that of the Aspergillus. The genus Microsphoera (Fig. 130) is a good type of the powdery mildews which are parasitic on many of the higher plants. They live on the surface of the leaves and are held in place by small haustoria which penetrate the epidermal cells. These surface mycelia give rise to erect sporophores bearing single terminal chains of conidia. The oogonia and antheridia are uninucleate terminal cells. Fertilization occurs in the usual manner and a solitary ascocarp- is formed. The ascocarps of the various genera of the powdery mildews present well-defined char- acters. One of the most common is M. alni, which causes the well-known whitish growth on the leaves of the lilac and many other plants in the late summer and fall. Some of the powdery mildews are very destructive to our agricultural crops. The Pezizas (Fig. 131) are cup-shaped and frequently very. 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 Cook, Melville Thurston, 1869-19
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