Orher VII. 
ALG^. 
925 
2282. Mesoglaia. 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. Fructifica- 
tion a granular mass in the articulations of the main filaments. 
2285. Oscillatoria. Plants gelatinous. Filaments simple, continuous, membranaceous, filled internally with 
transverse parallel striae. 
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 annuiated 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 thecje 
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. Fructifi- 
cation, granules scattered in the articulations. Salt andfresli water. 
2293. Bulbochcete. First filament articulated, sending out from the apex of the articulations an accessory 
branchlet. Thecse alternating with the 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. 
2295. Chara. Filaments spirally striated, jointed, with whorled branches. Organs of fructification two- 
fold, and close together ; first, nucules spirally striated, furnished with bracteae, and crowned ; second, 
colored globules. Sea and marshes. 
2296. Ceramimn. Filaments jointed, subdichotomous, red, articulations veined or diaphanous. Fructifica- 
tion ; capsules with an involucre of short ramuli. Marine. 
2297. Gr/ffithsia. Filaments jointed, rose red, branched. Articulations marked with one broad tube-like 
line, the joints pellucid. Fructification ; pedunculated capsules on the ramuli. Marine, 
2298. ChcEtospora. 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 setae, among which the sporules nestle. Marine. 
2299. Polysiphonia. Filaments jointed, longitudinally striated, with internal parallel tubes. Fructification ; 
double ovate capsules, and granules in swollen branchlels. Marine. 
2300. RytiphlcBa. 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. P'ilaments 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 j capsules. Marine. 
Tribe IV. ULVACEiE. 
Frond Tnembranous, continuous, tubular or flattened, never ribbed, herbaceous, or very rarely purple. Fruit a 
heap of sporules, either naked, or forming scattered granules covered by coniocystas. 
2304. Vaucheria. Filaments dichotomous or irregularly branched, somewhat rigid. Fructification; a granu- 
lated mass within the frond, and external dark vesicles variously sinuated. 
2305. Codium. Frond spongy, of a determinate figure formed of filaments densely packed, which are tubular 
and continuous, and colored by a granular green powder. Coniocystas clustered at the surface of the frond. 
2306. Bryopsis. Root minutely scutate. Filaments tubular, continuous, aggregated, branched, pinnate, or 
imbricated upwards with branchlets. Fructification a dark internal granular mass. 
2307. Solenia. Frond tubular, membranous, with a striated areolated surface. Sporidia very minute and 
compact. 
2308. Ulva. Root scutate. Frond plane, ribless, flabelliform or wedge-shaped, or linear and dichotomous. 
Fructification jiaked immersed; granules distributed in fours throughout the frond. 
2309. Porphyra. Frond flat, purple, with the membrane of equal texture. Fruit twofold ; first, sori of 
oval sporidia collected in a disorderly manner ; second, two parallel hnes marked on each side by a globule. 
Tribe V. FLORIDEiE. 
Frond coriaceous or rarely membranous, flat or filiform, continuous, purple or pink. Sporidia purple, included 
in capsules or clustered in sori. 
2310. Polyides. Frond filiform, fastigiate, cartilaginous, softish, composed of radiating fibres. Fruit, spongy 
warts composed of fibres supporting sporidia. 
2311. Ptilota. Root scutate. Fronds compressed or plane, pinnate. Fructification ; a cluster of naked 
granules surrounded by a linear cleft involucre. 
2312. Rhodomela. Frond either flat or foliaceous, and somewhat ribbed or filiform. Fr uit twofold ; first, 
lomenta filled longitudinally with globules of sporaceous matter ; second, capsules with a few pyriform sporidia 
sessile in the capsule (blackish when dry). 
2313. Chondria. Frond continous, gelatinoso-cartilaginous. Fructification double ; naked granules im- 
mersed in the substance of the ramuli and external tubercles. 
2314. Sphcerococcus. Root scutate. Frond submembranaceous or cartilaginous. Fructification uniform ; 
tubercles or capsules. 
2315. Halymenia. Frond flat or tubular, somewhat membranous. Fruit, dot-like tubercles half immersed 
in the lamina of the frond. 
2316. Bonnemaisonia. Frond filiform, compressed, pectinate, ciliated. Fruit, capsules with pyriform 
sporidia fastened together in a chain-like manner. 
2317. Belesseria. Root scutate. Frond plane, membranaceous, with or without ribs. Fructification double, 
tubercles and clusters of naked immersed granules. 
Tribe VI, FUCOIDE^. 
Frond coriaceous, rarely membranous, continuous, olive-green, flat or filiform. Sporidia black, included in 
capsules, which are either ovate, and sunvunded by a hyaline border, and nestling in a peculiar receptacle, or 
pyriform, and immersed in the frond. 
2318. Lemanea. Frond filiform, torulose, tubular. Chains of sporae adhering to the inner surface of the 
filament, pencilled moniliform. In fresh water. 
