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Calvatia cyathiformis
''Calvatia cyathiformis'', or Purple-spored Puffball, is a large edible saprobic species of ''Calvatia''. This terrestrial puffball has purplish or purple-brown spores, which distinguish it from other large Lycoperdales. It is found mostly in prairie or grasslands of North America, Australia, and probably elsewhere.
==Description==
The fruiting body is high and/or broad. When young it is relatively smooth and spherical or slightly flattened and purplish or brownish. It has a chocolate-brown or purple-colored gleba with a smooth exoperidium. As it matures it often becomes pear or irregularly-shaped and the exterior skin takes on a dark or silvery colour. As it ages the exterior dries and cracks and the fleshy spore-bearing interior breaks away to be distributed by wind and rain. After the spores completely disperse, "a soft leathery cup-shaped sterile base lightly rooted to the ground remains."〔() Accessed 12 Feb. 2011.〕
The spores are "3.5-7.5 µ; round, spiny or warty to nearly smooth. Capillitial threads 3-7.5 µ wide; thick-walled; minutely pitted."〔()〕
The spore mass turns from white to yellow to dull purple or purple-brown at maurity. It is said to be edible until the flesh begins to turn to a tan colour.〔Hall et al (2003), p. 147.〕
"To make a meal from most mushrooms, you probably hope to find at least a half dozen to a dozen, depending on the size. The large ''Calvatia'' species are special, because one or two at the most will probably be sufficient for a dinner for two. While this puffball does not have a strong flavor of its own, it is still quite good, and its ability to absorb flavors makes it a rewarding find."〔()〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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