266 ALGiE INARTICULATE. [Fucus. 



—Ag. Sp. Alg. v. 1. p. 62. Grev. Alg. Brit. p. 7.— C. abro- 



tanifolia, Ag. Sp. Alg. v. I. p. 63 Fucus fee niculaceus, Linn. — 



Turn. Hist. Fuc. t. 252. — F. discors, Linn. — Turn. Syn. Fuc. 



p. 70. E. Bot. t. 2131. — F. abrotanifolius, Linn Turn. Syn. 



Fuc. p. 66. E. Bot.t. 2130. 



Coast of the south and south-west of England. Summer. 2£. — In 

 a young state this plant has flat, pinnated leaves, one or two lines 

 broad, which in age are gradually converted into branches, and hence 

 has arisen the idea of 2 species, which the observations of Mrs. Grif- 

 fiths, Mr. Turner, and Dr. Greville have clearly bhown to be only dif- 

 ferent states of the same plant. 



5. C. fibrosa, Ag. (fibrous Cystoseira) ; frond bushy very 

 much branched, branches filiform the terminating branchlets (or 

 leaves) linear plane, vesicles elliptical mostly solitary, receptacles 

 filiform much elongated. Grev. — Ag. Sp. Alg. v. 1. p. 65. 



G/ev. Alg. Brit. p. 8 Fucus fibrosus, Buds. — Turn. Syn. 



Fuc. p. 93, Hist. Fuc. t. 209. E. Bot. t. 1969. 



Chiefly on the southern coasts, as Falmouth, Ilfracombe, Weymouth, 

 Hampshire, Dover, and Selsey. Yarmouth Beach and coast of York- 

 shire. Summer. If.. — " The vesiclesof this fine species," Dr. Greville 

 observes, " which are 3 or 4 times wider than the part in which they 

 appear, and about the size of a vetch-seed, with the bushy and some- 

 what harsh appearance of the frond, suffice to distinguish it at first sight." 



3. Halidrys. Lyngb, Halidrys. 



Frond compressed, coriaceous, linear, pinnated with disti- 

 chous branches. Air-vessels lanceolate, stalked, divided by 

 transverse septa. Receptacles lanceolate, stalked, compressed. 

 Seeds in distinct cells. Grev. Alg. Brit. p. 9. t. 1 — Name ; 

 «Xr, uXig the sea, and cd-j-,, an oak, or tree. 



1. H. siliquosa, Lyngb. (podded Halidrys}. Lyngb. Hydroph. 

 Ban. p. 37. — Cystoseira siliquosa, Ag. Sp. Alg. v. ]. p. 72. 

 Turn. Syn. Fuc. p. 60, Hist. Fuc. t. 159. E. Bot. t. 474.-/3. 

 smaller. Fucus siliquosus, Stackh. 



Sea-coast, every where. — /3. in pools or basins, exposed by the receding 

 of the tide. $ . 



4. Fucus. Ag. Linn, (part of). Fucus. 



Frond plane, compressed or cylindrical, linear, dichotomous, 

 coriaceous. Air-vessels, when present, innate in the frond, 

 simple, large. Receptacles terminal (except in F.nodosus), turgid, 

 containing tubercles imbedded in mucus, and discharging their 

 seeds by conspicuous pores. Grev. Alg. Brit. p. W.t. 2. — Name, 

 (pv/.og, a sea- weed. 



I have followed Dr. Greville in restricting the old genus 

 F\icus to those species enumerated by Agardh, with the exception 

 of Fucus (now Himardhalid) loreus, and Fucus (now Splach- 

 uidium) rugosus. The Fuci are among the most valuable of the 

 tribes in the preparation of kelp. 



