. Botany for agricultural students. Plants. ASPERGILLUS 375 higher Red Algae, such as Polysiphonia, for as the ascogenous hyphae develop from the ascogoniuin, sterile hyphae, growing up from below the ascogonium, form a compact hard wall which makes a case for the asci and ascospores, just as the filaments growing up from below the carpogonium produce a case for the carpospores in Poly- siphonia. The Blue and Green Molds (Plectascales). — S u p e r fi- cially these Molds resemble the true Molds discussed under the Mucorales, but their spore masses are gen- erally green or blue, while those of
. Botany for agricultural students. Plants. ASPERGILLUS 375 higher Red Algae, such as Polysiphonia, for as the ascogenous hyphae develop from the ascogoniuin, sterile hyphae, growing up from below the ascogonium, form a compact hard wall which makes a case for the asci and ascospores, just as the filaments growing up from below the carpogonium produce a case for the carpospores in Poly- siphonia. The Blue and Green Molds (Plectascales). — S u p e r fi- cially these Molds resemble the true Molds discussed under the Mucorales, but their spore masses are gen- erally green or blue, while those of the true Molds are black. There are about 250 known species in this order, but they are saprophytes and only a few of them are of much importance. They bear their ascospores in closed ascocarps or Cleisto- thecia. Aspergillus and Penicillium are two familiar genera of the order. Aspergillus.—These Molds are commonly green on ac- count of their greenish spore masses. One form known as the Herbarium Mold is troublesome in herbariums where it attacks specimens that are not well dried, often occur along with the true Molds. They will grow on cheese, leather, wall paper, fruit, hay, silage, and on most any damp object from which they can obtain nourish- ment. Some arc poisonous and stock are injured and sometimes killed by eating them in moldy Corn, hay, and silage. The loose extensive mycelium runs over and through the. Fig. 326. — A species of Aspergillus. A, a portion of a mycelium, showing a conidiophore bearing chains of conidia (300); B, sex organs coiled about each other and consisting of hyphae similar in appearance; C, the cleistothecium which develops after fertilization and in which the asci develop (X 200). They. 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. (John Nathan), b. 1
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1919
