title: A SECOND RECORD OF PORPHYRIDIUM SORDIDUM GEITLER(1).
abstract: A second record of the occurrence of Porphyridium sordidum Geitler 1932 is reported. Cultures were obtained by plating crude material on agar plates of various salinities with the higher salinities selectively favoring the growth of this species. Proposed synonymy of P. sordidum with P. cruentum is rejected. The author suggests that more attention be given to the establishment and use of depositories for living unialgal, reference cultures in taxonomical work on the more delicate algae, and that taxonomical manipulations of such forms based only upon word descriptions and the study of dried herbarium material should be viewed with a degree of caution.
authors.affiliation: Marine Biological Laboratory, Woods Hole, Massachusetts.
authors.forename: F D
authors.initials: FD
authors.lastname: Ott