Ptilota has a triphasic life cycle with isomorphic stages. Its gametes are oogamous and the algae is a perennial.
Description of Triphasic Life History:
The Tetrasporophyte has similar branchlets through which the tetraspororangia first develop adaxially (nearest the axis) but then spread towards all leaflets. The tetrasporangia are concentrated terminally on minute filaments with sterile filaments surrounding them. The tetrasporangia are tetrahedral in structure.
The Spermatangial structure on the male Gametophyte is rare but can be found on irregular bunches at the end of filaments. They form from tiny serrations on determinate branchlets.
The Carposporophyte stage forms cystocarps at the end of determinate branchlets. These are covered by involucral filaments which originate from the lower part of the branchlets and cover the cystocarps (Abbott 1976).
Abbott A., Isabella and George J. Hollenberg. Marine Algae of California. Stanford University Press. Stanford CA. 1976.