Tribe III
CONFERVOIDEE.
Filaments jointed either externally or internally, separate, and not combined in any definite form. 2273. Byssocladium. Filaments like cobwebs, scattered externally with sporidia. Slightly inundated. 2274. Mycinema. Filaments membranous, opaque, tenacious, colored (usually tawny). Slightly inundated. 2275. Chroolepus. Filaments rigid, nearly solid, opaque, crumbling into powder, torulose. On rocks or bark. 2276. Trentepohlia. Filaments flexible, colored, bearing capsules, which generally proceed from the last articulation, which is inflated. Inundated or fluviatile. 2277. Scytonema. Plant not gelatinous, coriaceous. Filaments short, forming dark dense tufts, beaded internally, or filled with annular transverse bodies. On rocks or inundated, rarely marine. 2278. Stigonema. Filaments continuous, coriaceous, naked, marked inside with dots disposed in rings. On rocks. 2279. Protonema. Filaments somewhat jointed, rooting very minute. 2280. Hygrocrocis. Filaments hyaline, arachnoid, obsoletely articulated, floating in a shapeless gelatine or in a colored membrane. 2281. Leptomitus. Filaments hyaline or slightly colored, arachnoid, obsoletely articulated, separate, erect, not entangled.
ORDER VII.
ALGÆ. 2282. Mesogloia. Frond filiform, cylindrical, gelatinous, with compact somewhat moniliform branches radiating from a medullary pith, and bearing capsules. 2283. Batrachospermum. Frond filiform, gelatinous, sending out from the primary filament moniliform gemmiferous branches. 2284. Draparnaldia. Filaments green, jointed, very gelatinous. Ramuli penicillate fascicled. Fructification a granular mass in the articulations of the main filaments. a granular mass in the articulations of the main filaments. 2285. Oscillatoria. Plants gelatinous. Filaments simple, continuous, membranaceous, filled internally with transverse parallel striæ. 2286. Calothrix. Filaments destitute of a mucous matrix, stiffish, straight, motionless, with a continuous tube annulated inside. 2287. Lyngbya. Filaments without a mucous matrix, freely floating, flexible, motionless, with a continuous tube annulated inside. 2288. Bangia. Filaments capillary, mostly simple, tubular, continuous. Fructification; granules disposed in regular transverse series or strata. 2289. Zygnema, Filaments jointed, simple, gelatinous, compressed, fragile, separating at the joints. 2290. Mougeotia. Filaments articulated, connected like a net, with irregularly placed granules, and thecæ attached to the angles of the meshes. 2291. Hydrodictyon. Filaments articulated, connected like a net. Articulations viviparous, including young individuals. 2292. Conferva. Filaments uniform, jointed, membranaceous, simple or branched, mostly green. Fructification, granules scattered in the articulations. Salt and fresh water. 2293. Bulbochæte. First filament articulated, sending out from the apex of the articulations an accessory accessory branches. Marshy. 2294. Nitella. Filaments consisting of a single tube, membranous, jointed, with whorled branches. Organs of fructification twofold and separate; first nucules spirally striated, without bractes, and not crowned second, colored globules. Sea and marshes. fructification twofold and separate; first nucules spirally striated, without bractes, and not crowned; second, colored globules. Sea and marshes. 2295. Chara. Filaments spirally striated, jointed, with whorled branches. Organs of fructification twofold, and close together; first, nucules spirally striated, furnished with bracteæ, and crowned; second, colored globules. Sea and marshes. , and close together; first, nucules spirally striated, furnished with bracteæ, and crowned; second, colored globules. Sea and marshes. 2296. Ceramium. Filaments jointed, subdichotomous, red, articulations veined or diaphanous. Fructification capsules with an involucre of short ramuli. Marine. ; capsules with an involucre of short ramuli.
Marine. 2297. Griffithsia. Filaments jointed, rose red, branched. Articulations marked with one broad tube-like line, the joints pellucid. Fructification pedunculated capsules on the ramuli. Marine. , the joints pellucid. Fructification; pedunculated capsules on the ramuli. Marine. 2298. Chatospora. Filaments obsoletely articulated, rosy, covered by axillary articulated fruit-bearing branches, which either include in the middle a globe of sporules, or change to a lanceolate receptacle covered with setæ, among which the sporules nestle. Marine. 2299. Polysiphonia. Filaments jointed, longitudinally striated, with internal parallel tubes. Fructification; double ovate capsules, and granules in swollen branchlets. Marine. 2300. Rytiphlæa. Frond flattened, distichous, transversely striated, becoming black when dry, with incurved ramenta. Fruit twofold; first, spherical capsules with pyriform sporidia; and second, lanceolate pods with roundish sporidia. Marine. 2301. Ectocarpus. Filaments jointed, much branched, fuscous. Fructification; lanceolate pods or ovate capsules solitary or racemose. Marine. 2302. Sphacellaria. Filaments jointed, branched, olivaceous, distichous or dichotomous; apex of the branches sphacellate or hyaline, abrupt. Fructification; granules in the sphacellated apex, or capsules. Marine. 2303. Cladostephus. Plant olivaceous. Main filaments opake, inarticulate; branches jointed, mostly whorled with ramuli. Fructification capsules. Marine. .