Puffball Puffball Pulse-amplitude modulation Category="Fungi"Category="Mushroom types"[image]

A puffball is a member of any of a number of groups of fungus in the division Basidiomycota. The puffballs were previously treated as a taxonomic group called the Gasteromycetes or Gasteromycetidae, but they are now known to be a polyphyletic assemblage. Their distinguishing feature is that they have gasterothecia (gasteroid basidiocarps) in which the spores are produced internally; that is, the basidiocarp remains closed, or opens only after the spores have been released from the basidia. The spores of puffballs are statismospores rather than ballistospores, meaning they are not actively shot off the basidium. They are called puffballs because of the Cloud of Brown dust-like spores which are emitted when the mature Fruiting body bursts. Puffballs and similar forms are thought to have evolved repeatedly (that is, in numerous independent events) from hymenomycetes by gasteromycetation, through Secotioid stages. Thus Gasteromycetes or Gasteromycetidae are now considered descriptive terms (more properly gasteroid or gasteromycetes) and not valid cladistic terms.

Habitat and structure

[image] Puffballs are common in meadows and woods and on heaths or lawns. When young, their fruiting bodies are whitish spheres, sometimes with short stalks, and are fleshy in texture. If cut across in this state, they show a compact rind enclosing a loose tissue, in the interspaces of which the spores are developed; as the fungus matures it changes to yellowish-brown and brown. When ripe, the rind tears at the apex and the spores escape through the aperture when any pressure is applied to the ball. When white and fleshy, the fungus is edible. The fibrous mass which remains after the spores have escaped has been used for tinder or as a styptic for wounds.

Edibility and identification

While most puffballs are not poisonous, and the poisonous puffballs are typically quite distinct from the non-poisonous ones, puffballs often look similar to young agarics, especially the deadly Amanitas. It is for this reason that all puffballs gathered in Mushroom hunting should be cut in half. Puffballs have an internal 'cup' shape, not a 'T' shape (except for unicapitate ones).

The Giant puffball, Calvatia gigantea (earlier classified as Lycoperdon giganteum), reaches a foot (30 cm) or more in diameter, and is difficult to mistake for any other fungus. It has been estimated that a large specimen of this fungus when mature will produce around 7 × 10¹² spores. If collected before spores have formed, while the flesh is still white, it may be cooked as slices fried in Butter, with a strong earthy, Mushroom flavour. It does not store well in a Freezer - the entire freezer rapidly acquires a strong mushroom odour.

Classification

Major orders:

Similarly, the true truffles (Tuberales) are gasteroid Ascomycota. Their ascocarps are called tuberothecia.

References