. Botany for agricultural students . Botany. 360 THALLOPHYTES True Molds (Mucorales). — There are a number of Molds some of which belong to other divisions of the Fungi. The Molds of this order are characterized by a zygosporic reproduc- tion, on which account they are called Zygomycetes. Of the nearly 200 species known, Bread Mold is the most familiar Fig. 311. — Conidia of the Late Blight of the Potato developing zoospores, and zoospores growing hyphae. X about 400. After Ward. Bread Mold (Rhizopus nigricans). — Bread Mold is very common about homes, producing a fluffy tangle of hyphae
. Botany for agricultural students . Botany. 360 THALLOPHYTES True Molds (Mucorales). — There are a number of Molds some of which belong to other divisions of the Fungi. The Molds of this order are characterized by a zygosporic reproduc- tion, on which account they are called Zygomycetes. Of the nearly 200 species known, Bread Mold is the most familiar Fig. 311. — Conidia of the Late Blight of the Potato developing zoospores, and zoospores growing hyphae. X about 400. After Ward. Bread Mold (Rhizopus nigricans). — Bread Mold is very common about homes, producing a fluffy tangle of hyphae on the surface of bread, fruit, and other favorable nutrient substances when left exposed {Fig. 313). It is sometimes injurious to Sweet Potatoes and other vegetables in storage. The fluffy tangle of hyphae is white while young but becomes dark when old, owing to the dark color of the mature sporangia. A strong poison has been found in connection with Rhizopus nigricans, and it has been suggested that some of the diseases of stock, such as the " cornstalk disease " and the " horse disease," prevalent in some of the Western states, may be due to the toxin which stock get in moldy fodder or other feed. The toxin apparently is only effective when introduced into the circulatory system. This is shown by the fact that rabbits can be fed the Mold without any injury, but when a little of the sap is expressed from the mycelium and injected into the blood, the animal dies almost instantly. The mycelium consists of numerous coenocytic branching hyphae. Some of the hyphae penetrate the substratum and gather food, while others grow above the substratum and produce the visible fluffy mass. The surface hyphae with more or less. 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 Martin, John N. (Joh
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
