Before revision: In other phyla of gymnosperms, coniferophyta and gnethophyta , the sperm is non motile, called siphonogamy and the pollen tube grows through the archegonia to help the sperm reach the egg more directly .
After revision: In other phyla of gymnosperms, the Coniferophyta and Gnetophyta , the sperm is non motile, called siphonogamy and the pollen tube delivers the sperm to the egg directly, in a process called siphonogamy .