Stump Puffballs
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Lycoperdon pyriforme
They are often pear-shaped as the name suggests, but they may also be nearly spherical.
When very young they are covered in small white spines that typically fall off before maturity.
A small developing pore may be visible at the top, while the sterile base of the mushroom is small and appears to be pinched in.
Colour ranges from nearly white to yellowish brown with the darker shades developing with age, though the base remains white.
The central pore ruptures at late maturity to allow the wind and rain to disperse the spores.
Common around Britain, usually in Autumn but sometimes in the Spring.