The large genus _Nitophyllum_ contains some beautiful rose-red sea weeds, with irregularly cleft membranaceous fronds, either veinless, or with a few indistinctly visible veins only at the base. The spores are in rounded sessile conceptacles scattered on the surface of the frond; and the tetraspores occur in clusters similarly scattered. One of the species--_N. laceratum_--so called from the torn and jagged appearance of the frond, is represented on Plate VII. The fronds are attached to a disc-like root, and are very variable in form, being sometimes so narrow as to appear almost threadlike. The plant grows on rocks and large weeds in the lower rock pools and in deep water. In the same genus we have _N. punctatum_, with broad pink fronds, dotted all over with spore-conceptacles and dark-red clusters of tetraspores; also a few other less common species that are seldom seen except after storms, as they grow almost exclusively in deep water. The genus _Delesseria_ contains some beautiful rose-coloured and reddish-brown weeds with delicate, leaf-like, symmetrical fronds, each of which has a darker midrib from which issue transverse veins. The spores are arranged like minute necklaces, and are contained in sessile conceptacles either on the midrib of the frond or on leaflets that grow from the midrib. The tetraspores are in clusters which are scattered over the frond or on its leaflets. The algæ of this genus are seldom found growing between the tide-marks, as they generally thrive in deep water, but splendid specimens are often washed up on the beach during storms, especially on the south and south-west coasts. [Illustration: FIG. 252.--_Delesseria alata_] [Illustration: FIG. 253.--_Delesseria hypoglossum_] Among these we may specially mention _D. alata_, known popularly as the Winged Delesseria, with a dark-red, forked frond, consisting of a strong midrib, bordered by a wing-like lamina of very variable width, supported by opposite veins. In this species the clusters of tetraspores are arranged on each side of the midrib or special leaflets near the tips of the frond. _D. sinuosa_ is a less common weed, with a disc-like root and an oblong, cleft and toothed frond, and tetraspores in leaflets growing from its margin. Another species--_D. hypoglossum_--is characterised by the leaflets of the midrib bearing still smaller leaflets in the same manner. We have already referred (p. 366) to a sea weed commonly known as the Dock-leaved Delesseria, the scientific name of which is _Maugeria_ (_Delesseria_) _sanguinea_. This plant was once included in the present order, but has been removed on account of the different structure of its fruit.