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This chapter covers six families, two families Phyllophoraceae and Rhizophyllidaceae belonging to order Gigartinales, one family Sebdeniaceae belonging to order Sebdeniales, one family Schizymeniaceae belonging to order Nemastomatales, and two families Plocamiaceae and Sarcodiaceae belonging to order Plocamiales. Thirteen species subordinating to genera Ahnfeltiopsis, Portieria, Sebdenia, Schizymenia, Plocamium, Sarcodia and Trematocarpus were recorded. These species were described in detail based on Chinese specimens and accompanied line drawings clearly illustrating inner tissue and reproductive structures. The species’ habitat and distribution were also documented.