. Minnesota plant diseases. Plant diseases. Minnesota Plant out one or more little tubes which elongate and finally, by branching, produce numerous threads; the spore is then seen at the center of a system of radiating threads, like the hub of a wheel and its spokes. These threads soon branch pro- fusely and now a circular, densely interwoven network is produced which keeps on enlarging, thus encroaching upon new areas of nu- trition. If the spore should be placed in nutrient jelly, where its' environments in v all directions are alike, the result- ing mycelium would be ball- shaped
. Minnesota plant diseases. Plant diseases. Minnesota Plant out one or more little tubes which elongate and finally, by branching, produce numerous threads; the spore is then seen at the center of a system of radiating threads, like the hub of a wheel and its spokes. These threads soon branch pro- fusely and now a circular, densely interwoven network is produced which keeps on enlarging, thus encroaching upon new areas of nu- trition. If the spore should be placed in nutrient jelly, where its' environments in v all directions are alike, the result- ing mycelium would be ball- shaped in outline; but if the myceli- um is produced in such a place as the mold soil on the forest floor, the symmetry of the form is interfered with by various obstacles. In general, a mycelium would tend to become circular in outline as seen from above. Such a myce- lium is ,often seen in the production of what are called fairy rings. Many gill-fungus mycelia grow from year to year and at the proper season of each year produce a crop of fruiting bodies at the surface of the ground. These are formed at the end of the mycelium and hence come tO' stand in a circle. One circle appears each year, becoming larger year by year. The peculiar life habits of many fungi bring with them peculiarities in the development. Many fungus spores will ger- minate between temperatures a little above freezing, ;-2°C., and 40°-43°C., but best at about 25°C. Such as are required to pass through the alimentary canal of certain animals before germinating demand, in general, higher temperatures. One of the gaseous constituents of the air, oxygen, is necessary to the germination of spores of fungi. Every housewife knows Fig. 7.—Highly magnified view of section through end of mycelial strand of honey-colored mushroom, showing compactness of central portion (c and d) and loose threads at the surface (a and b). Highly magnified. After Please note that these images are extracted from scanned
Size: 1855px × 1347px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectplantdi, bookyear1905
