19. Chordariaceæ—Frond gelatinous or cartilaginous, composed of interlacing vertical and horizontal filaments. Spores internal, attached to the filaments.
20. Dictyotaceæ—Frond inarticulate. Spores superficial, arranged in definite spots or lines.
21. Laminariaceæ—Frond inarticulate. Spores covering the whole frond or in cloud-like patches.
22. Sporochnaceæ—Frond inarticulate. Spores attached to jointed filaments which are either free or compacted.
23. Fucaceæ—Frond inarticulate, large and tough. Spores in globular cavities.
CHAPTER XVI
THE FLOWERING PLANTS OF THE SEA-SIDE
A considerable number of our flowering plants exhibit a decided partiality for the neighbourhood of the sea, and many are to be found only on the sea cliffs or in salt marshes not far from the shore. The principal of these will be now briefly described, dealing first with the monocotyledons, and then with the more highly organised dicotyledons.
The chief distinguishing features of these two groups have already been referred to, but it will be advisable here to give them in somewhat fuller detail.