Sterigma

Look up sterigma in Wiktionary, the free dictionary.

The sterigmata are the slender extensions that connect the spores (green) to the basidia (red).

In biology, a sterigma (pl.: sterigmata) is a small supporting structure.

It commonly refers to an extension of the basidium (the spore-bearing cells) consisting of a basal filamentous part and a slender projection which carries a spore at the tip.^[1] The sterigmata are formed on the basidium as it develops and undergoes meiosis, to result in the production of (typically) four nuclei. The nuclei gradually migrate to the tips of the basidium, and one nucleus will migrate into each spore that develops at the tip of each sterigma.^[2]

In less common usage, a sterigma is a structure within the posterior end of the genitalia of female Lepidoptera.^[3]

It also refers to the stem-like structure, also called a "woody peg" at the base of the leaves of some, but not all conifers, specifically Picea and Tsuga.^[4]

References

^ Kirk PM, Cannon PF, Minter DW, Stalpers JA (2008). Dictionary of the Fungi (10th ed.). Wallingford, UK: CABI. p. 665. ISBN 978-0-85199-826-8.
^ Ammirati J, Traquair JA, Horgen PA (1985). Poisonous Mushrooms of the Northern United States and Canada. Minneapolis: Fitzhenry & Whiteside in cooperation with Agriculture Canada. p. 28. ISBN 978-0-88902-977-4.
^ Powell JA, Opler PA (2009). "Introduction to Lepidoptera and Moths". Moths of Western North America (PDF). University of California Press. p. 6. ISBN 978-0-520-25197-7.
^ Eckenwalder JE. (2009). Conifers of the World: The Complete Reference. Portland: Timber Press. ISBN 978-0-88192-974-4.

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