A tubular cell projection that is part of a pollen tube cell and extends from a pollen grain.
Source:
GOC:tb,
PO:0025281,
PO:0025195
Comment
Carries the male gametes to into or near the ovule. May be branched in gymnosperms. This term replaces the obsolete term PO:0006345. Part of pollen tube cell (PO:0025195).