, Labellicula Ven De Vijver, Frenot, Beyens & Lange-Bertalot, 2005 , Lampriscus A. Schmidt in A. Schmidt et al. 1882 , Lauderia (Schütt) Lemmermann 1899 , Lauderiaceae (Schütt)Lemmermann,1899 , Lemnicola 1 , Lemnicola Round & Basson, 1997 , Lennoxia Thomsen & Buck, 1993 , Lepidodiscus O.N. Witt 1886 , Leptocylindraceae Lebour 1930 , Leptocylindrales Round & Crawford 1990 , Leptocylindrus P. T. Cleve in C. G. J. Petersen 1889 , Leyanella G.R. Hasle, H.A. von Stosch & E.E. Syvertsen 1983 , Licmophora C.A. Agardh 1827 , Licmophoraceae Kützing 1844 , Licmophorales Round 1990 , Licmosphenia C. Mereschkowsky 1902 , Lioloma Hasle, 1997 , Lithodesmiaceae H. & M. Peragallo 1897 - 1908 , Lithodesmiales Round & Crawford 1990 , Lithodesmioides H.A. von Stosch 1987 , Lithodesmiophycidae Round & Crawford 1990 , Lithodesmium C.G. Ehrenberg 1839 , Luticola , Luticola D.G. Mann in F.E. Round, R.M. Crawford & D.G. Mann 1990 , Lyrella N.I. Karayeva 1978 , Lyrellaceae Mann 1990 , Lyrellales Mann 1990