File:A text-book of mycology and plant pathology (1917) (14763150524).jpg

Identifier: textbookofmycol00hars (find matches)
Title: A text-book of mycology and plant pathology
Year: 1917 (1910s)
Authors: Harshberger, John W. (John William), 1869-1929
Subjects: Plant diseases Fungi
Publisher: Philadelphia : P. Blakiston's Son & Co.
Contributing Library: University of British Columbia Library
Digitizing Sponsor: University of British Columbia Library

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ages; g, formation ofconidial spores; i, ripe conidiospores; m, n, germination of conidiospores; o, roughdiagram of habit. (After Thorn.) considerable thickness, which consists of moulds and dried cheese surrounding ayellowish, waxy, creamy, or almost fluid interior depending upon the ripeness ofthe cheese. Probably originated about 1791 in the Department of Orne in north-western France, the industry has extended into other departments of the FrenchRepublic. It is made from whole fresh milk, or from milk which has been skimmedin part. The curd which forms at about 8o°to 85° is transferred to perforated tinforms, or hoops. These rest upon rush mats, which permit free drainage. After 7o8 ADDITIONAL EXERCISES draining, the cheese is frequently turned and in two or three days, it is carried to awell-ventilated room where the ripening process begins. Here it remains fifteento twenty days when the surface becomes covered with Penicillium Camemberti,which gradually breaks down the casein.
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Fig. 247.—Penicillium italicum. a, b, c, d, e, f, g, types of branching in verticilsand chains of conidiospores; j, k, sketches of conidial fructifications; /, m, n, swellingand germination of conidiospores. (After Thorn.) Penicillium slolonifcnim (¥\g. 246) grows on decaying fungi, Boleti, Polypori andin cultures from milk and ensilage. It has been collected repeatedly at Storrs,Conn., and once upon decaying Boletus scaler at the Jardin des Plantes in Paris, and APPENDIX VII 709 hence, it is probably widely distributed. Its stolon-producing character is verycharacteristic and diagnostic. Penicillium italicum (Fig. 247) and P. olivaceum occur on tropic fruits, includingpineapples, lemons, oranges, etc. The fungus causes extensive putrefaction in suchfleshy fruits as the pineapple. Penicillium bremcaule (Fig. 248) grows on decayed paper and it has been recom-mended by Gosio for the detection of arsenic, since when grown in media with tracesof arsenic, it forms the pungent compound d

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