The system of galactans from Cryptonemia crenulata (Halymeniaceae, Halymeniales) and the structure of two major fractions. Kinetic studies on the alkaline cyclization of the unusual diad G2S→D(L)6S

Cryptonemia crenulata biosynthesizes a family of sulfated and pyruvylated galactans consisting of both agaran- and carrageenan-type structures.