Like several North American puffballs, Lycoperdon umbrinum is usually shaped like an inverted pear (as the result of its sterile base) and is about the size of a golf ball or, at most, a tennis ball. It features a granular and spiny surface, but the spines when present are very short (1 mm long or shorter) and are soft and narrow, rather than cone-shaped and wide-based. The surface—especially on the top—is usually a shade of brown, and in most specimens the entire puffball becomes brown fairly early in development.
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