Peridium sessile. No sterile base. Peridium opening by an apical mouth.

Peridium sessile, with sterile base.

Upper surface breaking into fragments from above downwards.

Peridium splitting into starlike segments.

Peridium opening by a single mouth.

Section.

...Sterile base

Section

Genera

Bovista. Page 128.

Calvatia. Page 126.

Geaster. Page 129.

Peridium with sterile base.

Peridium opening by an apical mouth. Capillitium (threads) present.

Outer peridium gelatinous, and later disappearing. Base of interlacing fibres. Red star-like mouth.

Threads long,slen-de r, attached.

Threads short and free.

Lycoperdon. Page 124.

Bovistella. Page 129.

Calostoma. Page 131.