单词	pileus
释义	pileus /ˈpʌɪlɪəs / noun (plural pilei /ˈpʌɪlɪʌɪ/) Botany The cap of a mushroom or toadstool.CO2, levels above 1,000 ppm repress expansion of the pileus and stimulate stipe growth in a wide variety of commercially-grown species, leading to spindly mushrooms in high CO2 conditions.... The development is initiated as a hyphal knot of 0.2 mm or less in diameter, which rapidly develops into a tiny primordium containing the rudimentary tissues of the future pileus and stipe. Their compact pilei - tight-fitting in infant plants, robust and appetizingly domed in ripe ones - have a smooth (not lamellate) undersurface and a neat, strong stem. Origin Mid 18th century: from Latin, literally 'felt cap'.
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