268 algjE inarticulate. [Facta. 



Hist. Fuc. t. 90. E. Bot. t.V22\. Ag. Sp. Alg. v. 1. p. 95. 

 Grev. Alg. Brit. p. 15. 



Rocky sea-shores, abundant. Spring and Summer. If . — This con- 

 tains far less salt than F. vesicidosus, and is consequently much less 

 esteemed for kelp. In Norway it is the food of cattle, sprinkled with a 

 little meal, according to Gunner. The Dutch cover their crabs and 

 lobsters with it, and say that it is preferable to F. vesiculosus, because 

 the mucus from the vesicles of the latter ferments and soon becomes 

 putrid. Captain Carrnichael observes that " this Fucus is never 

 burnt for kelp on the shores of Appin, being found less productive of soda 

 than F. nodosus and F. vesiculosus, the only species here used for that 

 manufacture. It is employed as manure, and with much benefit, 

 though its value endures but for a single season. It is found peculiarly 

 well adapted to potato culture, and when spread on the ground in winter 

 yields an abundunt crop of the very best hay. But if its application 

 be deferred till the time of planting, the former produce, though equally 

 abundant, is watery, ill-tasted, and unfit for the table, though it answers 

 well enough for seed. This remark equally applies to all the Algae, 

 which, under the general name of Cart-wracks, are rolled ashore by the 

 gales." 



4. F. nodosus, Linn, (knotted Fucus); frond compressed 

 without a midrib subdichotomous branched in a pinnated man- 

 ner, vesicles remote, receptacles lateral distichous large pedun- 

 culated roundish- pyriform. — Turn. Syn. Fuc. p. 252, Hist. Fuc. 

 t. 91. E. Bot. t. 570. Ag. Sp. Alg. v. I. p. 85. Grev. Alg. Brit, 

 p. 16. — Halidrys nodosa, Lyngb. 



Rocky shores, common. Winter and Spring. If . — This is the most 

 thick and coriaceous of any of our Fuci. It is said in the Hebrides to 

 be preferable to all other Fuci in the manufacturing of kelp, and passes 

 there under the name of kelp-wrack. 



5. F. Mackdii, Turn. (Mr. Mackays Fucus); frond nearly 

 cylindrical subcompressed slender dichotomous the extremities 

 obtuse, vesicles elliptical solitary often wanting. — Turn. Hist. 

 Fuc.p. 52. E. Bot. t. 1927. Ag. Sp. Alg. v. 1. p. 87. Grev. 

 Alg. Brit. p. 17. — F. ?wdosus, y. Mackaii, Ag. Syst. Alg. 

 p. 275. 



Sea-shore of Cunnemara, Ireland, Mr. J. T. Mackay. From Arisaig 

 on the west coast of Ross-shire, to Kyle Scough in Sutherland, and on 

 the eastern shores of the isles of Skye and of Lewis. If. — It is found among 

 stones and on mud and sand, but apparently not growing there; collected 

 into very dense tufts; the fronds 8 — 10 inches long. Fructification un- 

 known. 



6. F. canaliculdtus, Linn, (channelled Fucus); frond linear 

 channelled destitute of midrib and vesicles dichotomous emar- 

 ginate at the extremities, receptacles terminal oblongo- cunei- 

 form turgid bipartite obtuse. — Turn. Syn. Fuc.p. 242, Hist. Fuc. 

 t. 3. E. Bot. t. 823. Ag. Sp. Alg. v. I. p. 96. Grev. Alg. Brit, 

 p. 18. 



Abundant on rocks on the sea-shore. Summer and Autumn. If. — 

 6 — 7 inches long ; well distinguished by its small grooved fronds. 



