168 ALG.E MELANOSPERME.E. [Fucus. 



linear-lanceolate, mostly proceeding from the terminal vesicles. 

 Grev. Hook. Br. FL v. ii. p. 265. E. Bot. £.2131. 



On the western and southern shores. 



4. C. fibrosa, Ag. Fibrous Cystoseira. Frond bushy, very 

 much branched ; branches filiform, the terminating branchlets 

 (or leaves) nearly plane ; vesicles elliptical, mostly solitary ; 

 receptacles filiform, much elongated. Grev. Hook. Br. FL v. ii. 

 p. 266. E. Bot. t. 1969. 



On the western and southern shores. Galway Bay ; J. T. Mackuy. 

 Bantry Bay ; Miss Hutchins. Malbay ; W. H. Harvey. Black 

 rock?, Portrush ; Mr. D. Moore. 



2. Halidrvs. Lyngb. Halidrys. 



Frond compressed, coriaceous, linear, pinnated with distichous 

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

 verse septa. Receptacles lanceolate, stalked, compressed. 

 Seeds in distinct cells. Grev. Name ; aX?, a\is> the sea, and 

 dpi'?, an oak, or tree. 



1. H. siliquosa, Lyngb. Podded Halidrys. Vesicles com- 

 pressed, petiolated, linear-lanceolate, attenuated to a point. 

 Hook. Br. FL v. ii. p. 266. E. Bot. t. 474. 



Common on all our shores. The beautiful Fucus Osmundaceus, 

 Turn. t. 105, from the North-west Coast of America, is a second spe- 

 cies of this genus. 



3. Fucus. Ag. Fucus. 



Frond plane, compressed or cylindrical, linear dichotomous, 

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

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

 containing tubercles imbedded in mucus, and discharging 

 their seeds by conspicuous pores. Grev. — Name ; (pvtcos, a 

 sea-weed. 



1. F. vesiculosus, Linn. Bladdered Fucus. Frond coria- 

 ceous, flat, dichotomous, entire, furnished with a midrib ; vesi- 

 cles sphserical, (mostly in pairs) ; receptacles terminal, turgid, 

 elliptical. Hook. Br. FL v. ii. p. 267. E. Bot. t. 1066. 



Sea shores, very abundant. A very variable species ; many of the 

 varieties destitute of vesicles. Dr. Greville's variety " Caterifructus" 

 is so completely intermediate with the following, that it may be de- 

 bated to which species it most properly belongs. 



2. F. ceranoides, Linn. Horned Fucus. Frond coriaceo- 

 membranaceous, entire, furnished with a midrib, pinnated with 

 lateral, dichotomous, fruit-bearing branches, without vesicles ; 

 receptacles lanceolate, linear, acuminated. Hook. Br. FL v.ii. 

 p. 267. E. Bot. t. 2115. 



