^C. prolifera.^ Frond or lamina flat and leaf-like, two to four inches long, one half to three quarters of an inch wide, either simple or once forked; margin entire. Similar laminæ spring from the surface or from the edge or base of the different leaf-like portions. Laminæ rise from the upper side of the creeping, rooting stem. Its substance is somewhat horny and translucent.
^C. Mexicana.^ Prostrate, creeping stem, with rootlets or holdfasts below, and leaf-like fronds above; fronds simple or with one or two branches deeply cut in narrow lobes nearly to the center. The species abounds at Key West. (Plate VIII.)
OLIVE-GREEN AND BROWN SEAWEEDS (PHÆOPHYCEÆ)
TABLE SHOWING THE CLASSIFICATION OF THE OLIVE-GREEN AND BROWN SEAWEEDS DESCRIBED IN THIS CHAPTER
Subclass =Phæophyceæ= (/Olive-Green and Brown Seaweeds/)
=ECTOCARPACEÆ= ^Ectocarpus^ ^E. littoralis^ ^E. siliculosus^ ^E. viridis^ ^E. tomentosus^
=SPHACELARIACEÆ= ^Sphacelaria^ ^S. cirrhosa^ ^S. radicans^ ^Cladostephus^ ^C. verticillatus^
=ENC[OE]LIACEÆ= ^Punctaria^ ^P. latifolia^ ^P. tenuissima^ ^P. plantaginea^ ^Asperococcus^ ^A. echinatus^ ^Phyllitis^ ^P. fascia^
=DESMARESTIACEÆ= ^Desmarestia^ ^D. viridis^ ^D. aculeata^ ^D. ligulata^ ^Arthrocladia^ ^A. villosa^
=DICTYOSIPHONACEÆ= ^Dictyosiphon^ ^D. f[oe]niculaceus^
=CHORDARIACEÆ= ^Chordaria^ ^C. flagelliformis^ ^Mesogl[oe]a^ ^M. virescens^ ^M. divaricata^ ^Leathesia^ ^Myrionema^
^Laminaria^ ^L. longicruris^ ^L. saccharina^ ^L. digitata^ ^Macrocystis^ ^Nereocystis^ ^Lessonia^ ^Thalassiophyllum^
=DICTYOTACEÆ= ^Dictyota^ ^D. fasciola^ ^D. dichotoma^ ^Zonaria^ ^Z. lobata^ ^Taonia^ ^T. atomaria^ ^Padina^ ^P. pavonia^ ^Haliseris^ ^H. polypodioides^
=FUCACEÆ= ^Himanthalia^ ^H. lorea^ ^Fucus^ ^F. vesiculosus^ ^F. serratus^ ^F. furcatus^ ^F. ceranoides^
^Ascophyllum^ ^A. nodosum^ ^Phyllospora^ ^P. Menziesii^ ^Cystoseira^ ^C. expansa^ ^Halidrys^ ^H. osmunda^ ^Sargassum^ ^S. vulgare^ ^S. Montagnei^ ^S. bacciferum^
This subclass contains some of the most remarkable of the seaweeds. It is especially notable for the diversity of its plant forms, which range from filaments to plants which appear to have stems and leaves (/Sargassum/). The species vary in size from very small fronds to those of immense size (the /Laminariaceæ/). It includes /Fucus/ (the rockweeds), a very conspicuous genus, which furnishes fully three fourths of the vegetable covering of the tidal rocks in the localities in which it grows.