Order VII
ALGE.
Plants ascending from the simplest form known in vegetation to a very compound state. The lowest are filiform, leafless, with their fructification immersed ; the highest are leafy, with the fructification included in an indehiscent wart-like pericarpium . Some copulate like animals, others have a spontaneous motion like worms. Their color is lively, in the lowest grades green, in the highest red or purple. Some are ephemeral and microscopical, annual or perennial, and others extend to the length of many fathoms. They grow at the bottom of the sea, or in fresh water, the depths of which they clothe with vegetation, as the higher orders of plants cover the earth with forests.
They grow on stems in the water only, or on each other. Some exhale oxygen, others are scented like violets.
Their taste is mild; their substance gelatinous, membranous, or coriaceous, usually covered externally with mucus. The structure of the lowest is articulated; of the highest fibrous.
Tribe 1. DIATOMEÆ. 2259 Achnánthes Ag. 2260 Diátoma Ag. 2261 Fragillária Ag. 2262 Meloseíra Ag.
Tribe 2.
NOSTOCHINE. 2267 Alcyonídium Ag. 2268 Nóstoc Ag.
Tribe 3. 2265 Palmélla Ag. 2266 Echinélla Ag. 2273 Byssocládium Ag. 2274 Mycinéma Ag. 2275 Chroolépus Ag.
Chroolépus 2276 Trentepóhlia Ag 2277 Scytonéma Ag. 2278 Stigonéma Ag. 2279 Protonéma Ag. 2280 Hygrocrócis Ag. 2263 Desmídium Ag. 2264 Schizonéma Ag. 2269 Corynéphora Ag. 2271 Chætóphora Ag. 2270 Rivulária Ag 2272 Scythyménia Ag.
CONFERVOIDEE. 2289 Zygnéma Ag. 2290 Mougeótia Ag. 2281 Leptomítus Ag. 2282 Mesoglóia Ag. 2283 Batrachospermum Ag. 2291 Hydrodictyon Ag. 2284 Draparnáldia Ag. 2285 Oscillatória Ag. 2286 Cálothrix Ag. 2287 Lýngbya Ag. 2288 Bángia Ag. 2304 Vauchéria Ag. 2305 Códium Ag. 2310 Polyídes Ag. 2311 Ptilóta Ag. 2292 Conférva Ag. 2293 Bulbochæ'ta Ag. 2294 Nitélla Ag. 2295 Chára L. 2296 Cerámium Ag.
Tribe 4. ULVACEÆ. 2306 Bryópsis Ag. 2307 Solénia Ag.
Tribe 5. 2312 Rhodoméla Ag. 2313 Chóndria Ag.
FLORIDEÆ. 2297 Griffithsia Ag. 2299 Polysiphónia Grev. 2298 Chætospóra Ag. 2300 Rytiphlæ'a Ag. 2301 Ectocarpus Ag. 2302 Sphacellária Ag. 2303 Cladostéphus Ag. 2308 U'lva L. 2309 Porphyra Aş 2314 Sphærocóccus Ag.' 2315 Halyménia Ag.
Tribe 6. FUCOIDEE. 2316 Bonnemaisónia Ag. 2317 Delesséria Ag. 2318 Lemánea Ag. 2319 Chordária Ag 2320 Scytosiphon Ag. 2321 Sporóchnus Ag. 2322 Halíseris Ag. 2323 Encœlium Ag. 2324 Zonária Ag. 2325 Laminária Ag. 2326 Lichína Ag. 2327 Furcellária Ag. 2328 Fúcus L. 2329 Cystoseíra Ag.