. Observations on recent cases of mushroom poisoning in the District of Columbia. Mushrooms. 11 Other species of puffball grow in the District of Columbia, but only two others, so far as known, approach this in size. The small species are commonly an inch or less in diameter, while the com- moner of the two large species has an almost pure white surface, and when old the spores it produces, like those of the other large one, are yellowish-brown instead of purplish-brown as in the present species. None of the puff balls with a pure white interior are known to be poisonous. About Washington puff
. Observations on recent cases of mushroom poisoning in the District of Columbia. Mushrooms. 11 Other species of puffball grow in the District of Columbia, but only two others, so far as known, approach this in size. The small species are commonly an inch or less in diameter, while the com- moner of the two large species has an almost pure white surface, and when old the spores it produces, like those of the other large one, are yellowish-brown instead of purplish-brown as in the present species. None of the puff balls with a pure white interior are known to be poisonous. About Washington puff balls are found commonly in the autumn on lawns and in pastures, especially upon the vacant lots in the edge of the city serving as ''commons," where the soil has remained. Fig. 12— Fairy ring formed by Marasmius oreades, an edible mushroom. undisturbed for many years and has been closely grazed by cattle. If one examines with some care such an area on which puff balls are growing he will find that adjacent puff balls are usually arranged at irregular intervals along a circular line and that the greater part of the circle, sometimes the entire circle, is marked by a band of grass slightly darker in color than that on either side. These circles are commonly four to eight feet in diameter and sometimes much larger. One has been measured that was 24 feet across. The band of dark- green grass is usually about a foot in breadth. These circles, which are known as "fairy rings," are more conspicuously developed in the next species where their structure is described more in 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 Coville, Frederick V. (Frederick Vernon), 1867-1937; United States. Divison of Botany; United States. Department of Agriculture. [Washington : Govt. Print. Off. ]
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