Naccariaceae
Naccariaceae is a family of red algae in the order Bonnemaisoniales, with 3 monotypic genera that are found in both the Pacific and Atlantic Oceans.
History
It was circumscribed by Harald Kylin in 1928. When established the family only had 2 genera, Atractophora and Naccaria. It was also suggested in 1987 and in 1997 that the genera should be placed in the Gigartinales Order. But said that the similarities in nutritive cells and carpospore germination, noted that the order Bonnemaisoniales was better used instead, Womersley, 1996 agreed. The family is not monophyletic.Description
They have a thallus which is erect, mucosoid and irregularly radially branched. The structure is uniaxial; axial cells initially ecorticate, but eventually with a cortex, or surrounded by rhizoids that can be secondarily inflated. They have determinate branches arising in a spiral or whorled pattern. The plants are usually dioecious. The spermatangia in clusters on outer cells. The Carpogonial branches are borne on basal cells of lateral branches, with nutritive cells. The fertilised zygote generally fusing with the hypogynous cell, then producing a diffuse or discrete gonimoblast lacking a pericarp. Tetrasporophytes, where known, are microscopic and filamentous, with lateral or terminal tetrahedrally divided tetrasporangia.The gonimoblast filaments develop directly from the fertilized carpogonium though the carpogonium may fuse with the cell in the carpogonial branch.
Genera
As accepted by GBIF;Atractophora .Naccaria ReticulocaulisAlso Liagorothamnion is listed as an accepted genus by WoRMS and AlgaeBase and placed within the Order Atractophorales.