Pe
, Peckichara L.Grambast, 1957 , Peckisphaera L.Grambast, 1963 , Peniaceae Haeckel, 1894 , Penium Brébisson ex Ralfs, 1848
Ph
, Phycastrum Kützing ex Kützing, 1849 , Phymatodocis Nordstedt, 1877
Pi
, Piriformachara Junying Liu & Xinying Wu, 1985
Pl
, Planotaenium (Ohtani) Petlovany & Palamar-Mordvintseva, 2009 , Platychara L.Grambast, 1963 , Pleurotaenium Nägeli, 1849
Po
, Polychaetophora West & G.S.West, 1903 , Porochara K.Mädler, 1955 , Porocharaceae
Pr
, Prescottiella C.E.M.Bicudo, 1940
Py
, Pyxispora West & G.S.West