Boodleaceae Børgesen, 1925 family accepted

Bestjachica P.N. Kolosov in A.K. Bobrov, 1970 genus accepted

Parmacaulis V.P. Shuysky & D.I. Schirschova in V.P. Shuysky, 1987 genus accepted

Issinella E.A. Reitlinger, 1954 genus accepted

Calcicaulis V.P. Shuysky & D.I. Schirschova in V.P. Shuysky, 1987 genus accepted

Catenaella V.P. Shuysky, 1987 genus accepted

Siphonocladaceae Schmitz, 1879 family accepted

Valoniaceae Kützing, 1849 family accepted

Culmiella V.P. Shuysky in V.P. Shuysky & D.I. Schirschova in V.N. Dubatolov & T.A. Moskalenko, 1988 genus accepted