Siphonogamy

Pollen tubes, sperm, and ovule of Cycadophyta

Siphonogamy is a condition in plants in which pollen tubes are developed for the transfer of the male cells to the eggs. The seed plants are siphonogamous, while in the lower plants the male cells usually swim to the eggs. As a consequence, the spermatophytes were sometimes called siphonogams.

References

•  This article incorporates text from a publication now in the public domain: Beach, Chandler B., ed. (1914). "Siphonogamy". The New Student's Reference Work. Chicago: F. E. Compton and Co.