- (biology) A slim projecting part of the basidium of some species of fungi that carries the basidiospore.
- (biology) A woody projection from the tip of the leaf base in certain conifers (Picea and Tsuga).
2009, Eckenwalder, J.E., Conifers of the World: The Complete Reference, Timber Press, ISBN 978-0881929744:
- These sterigmata are retained and make the twigs rough for several years after leaf fall.
- (biology) Part of the genitalia of moths.