Pseudogrinnellia barrattiae gen. et sp. nov., a new member of the red algal family Delesseriaceae from the Sultanate of Oman

Pseudogrinnellia barrattiae M. J. Wynne gen. ct sp. nov., a monotypic genus of Delesseriaceae (Rhodophyta), is described from the Sultanate of Oman. T he new genus is based on three tetrasporangial specimens collected from the southern part of Oman on the northern Arabian Sea during the monsoon seaso n. Pseudogrinnellia is assigned to the tribe Delesserieae and is distinguis hed by the following combination of characteristics: a monostromatic, weakl y costate blade, simple or bearing one order of small bladelets from the mi drib; faint development of lateral veins in basal portion of blade; lateral pericentral cells undergoing transverse division; numerous small tetraspor angial sori randomly scattered over primary blade surface; and the producti on of microscopic bladelets from the soral regions.