- (mycology) A slim projecting part of the basidium of some species of fungi that carries the basidiospore.
- (botany) 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:
- These sterigmata are retained and make the twigs rough for several years after leaf fall.
- (entomology) Part of the genitalia of moths.