=RALFSIACEÆ= ^Ralfsia^ =ENCŒLIACEÆ= ^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. fœniculaceus^ =ELACHISTACEÆ= ^Elachista^ =CHORDARIACEÆ= ^Chordaria^ ^C. flagelliformis^ ^Mesoglœa^ ^M. virescens^ ^M. divaricata^ ^Leathesia^ ^Myrionema^ =LAMINARIACEÆ= ^Chorda^ ^C. filum^ ^Alaria^ ^A. esculenta^ ^Agarum^ ^A. Turneri^ ^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^ =CUTLERIACEÆ= ^Cutleria^ ^C. multifida^ =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^ [pg064] OLIVE-GREEN AND BROWN SEAWEEDS 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. ORDER =ECTOCARPACEÆ=