Order 7. Desmarestiaceæ. Desmarestia aculeata is common.
Order 8. Myriotrichiaceæ. Myriotrichia.
Order 9. Elachistaceæ. Elachista fucicola is a common epiphyte on species of Fucus.
Order 10. Chordariaceæ. The shoot-systems are often surrounded by mucilage. Chordaria; Leathesia difformis occurs as rounded, brown-green masses of the size of a nut, generally attached to other Seaweeds.
Order 11. Stilophoraceæ. Stilophora rhizodes is common.
Order 12. Spermatochnaceæ. Spermatochnus paradoxus is common.
Order 13. Sporochnaceæ. Sporochnus.
Order 14. Ralfsiaceæ. Ralfsia verrucosa is common as a red-brown incrustation on stones and rocks at the water’s edge.
Order 15. Lithodermataceæ. Some species of the genus Lithoderma occur in fresh water.
