Aardbol

Aardbol, the Dutch term for earthball, refers to a group of spherical fungi in the family Sclerodermaceae, most commonly the genus Scleroderma. They are generally not edible and are considered poisonous. Young earthballs can be mistaken for puffballs, but their internal development and mature coloration differ, making them unsafe to eat.

Description: Earthballs are hard, rounded fruiting bodies with a thick peridium. The exterior can range from yellowish-brown to dark purple-brown and may be smooth or textured. Inside, the gleba starts white in young specimens and gradually darkens through olive and brown to a dark purplish-black mass as it matures. Unlike puffballs, earthballs are not hollow inside and lack a typical mushroom cap or gills. When cut, they show a solid or densely packed spore mass rather than a clean, hollow interior.

Taxonomy and species: Most earthballs belong to Scleroderma within the Sclerodermaceae. Scleroderma citrinum is a common European and North American species. Other species occur across woodlands, grasslands, and urban areas, often forming associations with trees or growing saprotrophically in rich soils.

Habitat and ecology: Earthballs occur in temperate regions worldwide. They fruit from late summer to autumn, often under deciduous or coniferous trees, in grasslands, or in urban habitats with ample organic matter. Their ecological role varies by species, being either saprotrophic or ectomycorrhizal with trees.

Safety and identification: Do not eat earthballs. They can cause gastrointestinal distress if ingested. They may resemble edible puffballs when young, but the interior darkens with maturity, making identification unreliable as a safety check. If in doubt, discard and rely on clearly identified edible species for consumption.