8. Calvatia. Page 582.

Peridium large, globose or turbinate, breaking up into fragments from above downward, and gradually falling away; threads of the capillitium very long, much branched and interwoven.

9. Lycoperdon. Page 589.

Peridium small, globose, obovoid or turbinate, membranaceous, dehiscent by a regular apical mouth, threads of the capillitium long, slender, simple or branched.

10. Bovistella. Page 608.

Peridium subglobose, membranaceous, dehiscent by a regular apical mouth; threads of the capillitium free, short, several times dichotomously branched.

(e) Peridium sessile, without any thickened base.

11. Catastoma. Page 609.

Peridium globose, subcoriaceous, dehiscent by a basal aperture; threads of the capillitium free, short, simple, or scarcely branched.

12. Bovista. Page 610.