A rose-red filamentous sea-weed being from two to six inches in height, with the stems not much thicker than bristles, their fronds being long, is found on rocks near low-water mark, and generally in deep pools from Orkney to Cornwall. It is called Griffithsia Corallina. Other kinds of Rhodymenia are common on rocks and stones, or on the stems of the tangles, near the very verge of low-water, or higher up. One found in the first situation is most common in the southwest of England, but is found everywhere on the British shores. It has a little disk for a root, and a long, slender stem, rather round near the root and flat above, where it gradually expands into a red membrane in the shape of a fan. But it is not whole, for it rather resembles a skeleton of a fan with notches at the edges, a dark spot being at their ends. The whole may be four inches long. The other kind is purplish, and the stem has branches, each of which ends in a ragged fan. It has little knobs on the side of the stem and on the membraneous parts which bear the spores. It is sometimes called by another generic name, that of leaf-bearer, or Phyllophora. A rose-red sea-weed which has a midrib along all its thin branching fronds, and which is like a flat miniature bushy tree, is common all round British coasts, between tide-marks and more deeply. The tips of the fronds have little bodies on them which are whiter than the rest, and which contain peculiar spores, and there are also little knobs or tubercles which are attached to the midrib, and these contain another kind of spore. It belongs to a number of sea-weeds which have been named Delesseria, after Baron Delessert, a former distinguished botanist. Another, which is called Delesseria sanguinea, from its blood-red, or rather rose-fed color, has a frond like a laurel-leaf, but it is crumpled at the edges. It is thin, has a midrib, and several spring from a stalk. Little fronds come from the midrib, in the middle of the larger fronds. It is one of the many weeds that fruit in winter time, and it is to be found in deep rock-pools, between tide-marks, and generally at the shady side of the pool under projecting ledges of rock. It is a great favorite, and grows to a considerable size, the fronds reaching sometimes ten inches in length. Perhaps the most beautiful of the red weeds is found on rocks, and on other sea-weeds, at low-water mark. It resembles a number of skeleton leaves on a stem dyed a fine red, for the frond is not a membrane, but a number of branching threads or hairs, and it arises from a stem. It is from six to eight inches in length, and is named Dasya, from _dasus_, the Greek for hairy. It is much used for ornamental purposes in the collections of sea-weeds.