. Practical botany. Botany. 218 PRACTICAL BOTANY Sometimes living fish that are confined in close quarters become infested with this mold and die. In such cases the mold is first a parasite, but upon the death of its host it becomes a saprophyte. In late summer and early autumn, flies and other insects often become infected with water molds and related fungi (as EntomopJithora). If these insects, when found lying on the floors and window sills, are placed in a dish of water, the mold sometimes grows rapidly, soon producing a "collar" of fluffy hyphse about the thorax of the insect, a
. Practical botany. Botany. 218 PRACTICAL BOTANY Sometimes living fish that are confined in close quarters become infested with this mold and die. In such cases the mold is first a parasite, but upon the death of its host it becomes a saprophyte. In late summer and early autumn, flies and other insects often become infected with water molds and related fungi (as EntomopJithora). If these insects, when found lying on the floors and window sills, are placed in a dish of water, the mold sometimes grows rapidly, soon producing a "collar" of fluffy hyphse about the thorax of the insect, and may cover the entire body (Fig. 177). 206. Watermold: vegetative structures and nutrition. The mycelium of Sapro- hgnia branches and extends itself through- out the tissues of its supporting material. As in Mucor and Vauclieria, the plant is a It absorbs its food material directly, and when the supply of food is abundant it may grow with striking ra- pidity. This plant is effective in bring- ing about decay of dead animal bodies in the water. 207. Water mold: asexual reproduction. At times the numerous hj-phse which extend from the nourishing material may form transverse \\'alls, which separate large swollen tip segments from the bases of the hyphse. ^^"ithin each tip segment many zoospores form (Fig. 178). These escape into the water in very large numbers and swim about quite actively. Upon coming in contact with favorable nutriment the cilia are withdrawn and the zoospore germinates into a new hypha, which by growth may produce a new mycelium. 208. Water mold: sexual reproduction. From the tips of short hyphse large spherical cells (oogonia) are formed, in each of which one to many eggs are produced. In some. Awatermold bearing a sporangium (s), from wliicli zoo- spores (z) are escaping After Schencli;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appear
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