Thallus a slender membranous blade composed of 'monostromatic cells about 15 - 30 cm high (highest more than 30 cm) and 1 - 4 cm wide (a small number about 5 cm), purple red in color, a little green near the wedge shaped base; heart with a small round discoid holdfast and an unclear stipe; blade margin with microscopicl-celled denticles; thallus about 21 - 35 μm thick in the middle portion, becoming thinner and thinner at the margin, about 14 μm; mucilage membrane about 3.5 - 8.7 μm thick; with a little fold at the margin of the blade; surface view of vegetative cell a triangle, quadrangle of irregular polygon, cross section view a slightly rounded rectangle about 18 - 21 μm high, 14 - 17 μm wide; each cell with a stellate chromatophore.

Thallus homothallic and producing mcmospores, spermatangia first appearing along the two edges of thallus, then the carposporangia appear at the inner portion, spermatangia a eight yellow mottled stripe; when appearing in a small area at the inner portion spermatangia mixed with monosporangia and monospores, have the same appearance as Porphyra yezoensis Ueda. 'The ♂ division formula is A₄B₄C₄, ♀ division formula is A₂B₄C₂.

The present species and P. yezoensis Ueda are very much alike, but P. yezoensis Ueda belongs to section edentate, so they belong to two different species. Compared with several common Porphyra species of section dentate from Fujian Province, such as Porphyra hainanensis, Porphyra suborbiculata, Porphyra crispata and Porphyra monosporangia, the present specoes is different from them in appearance, thickness, reproductive cell, etc. So we regard it as a new .species of section dentata and name it Porphyra fujianensis sp. nov..