Okd.VII. Tribe VI. ALG.E FUCOIDEiE. 
941 
15347 Frond flat with spherical tubercles 
15348 Frond roundish with elliptical tubercles 
15349 The only species 
15350 Stem compressed here and there inflated with internal vesicles. Receptacles lateral distic. stalk, pyriform 
15351 Frond flat ribbed lin. dichotom. entire. Vesicles spherical innate upon frond in pairs, Recept. term, elliptical 
15352 Frond lin. costate ent. somew. dichotom. without vesicles, Lateral segm. narrowest multif. fruit-bearing 
15353 Frond linear entire dichotomous without vesicles ribbed, Receptacles linear-elliptical 
15354 Frond dichotomous ribbed serrated, Recept. solitary flat serrated 
15355 Frond linear nerveless channelled dichotomous, Recept. terminal 
15356 Frond filiform somewhat dichotomous, Recept. terminal cylindrical 
15357 Cup radic. circular plano-convex emitt. from its centre a frond terminat. in a very long dichotom. recept. 
15358 Lvs. densely spiny all over, Vesic. ellipt. somew. term, crown, solit. Recept. warty from inflat. base of spines 
15359 Lvs. filiform dichotom. unarmed, Vesicles lanceolate chained, Recept. terminal ovate ellipt. mucronate 
15360 Lower leaves thin costate pinnate, Pinnee lanceolate crenulate, Vesicles lanceolate somewhat solitary 
15361 Lvs. unarmed filif much branched. Vesicles innate ovate-elliptical somew. chained, Recept. filif. terminal 
15362 Stem compressed pinnated. Leaves distichous flat linear entire, some bearing vesicles, others receotacles 
and Miscellaneous Particulars. 
For rural economy, this and other species of Fucus are burned for their ashes, which produce the kelp or 
potash of commerce. On those shores of the sea where these plants do not abound, and where the water is 
sufficiently saline, the different species of fuci are raised artificially, by depositing stones at regular distances, 
on which the fuci spring up of themselves, and in four years yield a crop fit for cutting. Those v.'ho are 
interested on this subject will find ample information in the Transactions of the Highland Society of Scotland 
(vol. viii.), and in Headrick's Survey of Forfarshire. A condensed view of what is known on the subject will 
be found in the Encyclopeedia of Agriculture i7i loco. 
2329. Cystoseira. From fcvims, a bladder, and a-ii^ot, a chain. The upper parts of the frond have the appear- 
ance of little bladders chained together. 
3 P 2 
