Ser. Melanosperme^;. Fam. Laminariea. 



Plate CCXLI. 



LAMINARIA BULBOSA, Zamour. 



Gen. Char. Frond stipitate, coriaceous or membranaceous, flat, undivided 

 or irregularly cleft, ribless. Fructification ; cloudy spots of spores, 

 imbedded in the thickened surface of some part of the frond. Lami- 

 naria (Lamow.), — from lamina, a thin plate, in allusion to the flat 

 frond. 



Laminaria bullosa ; stem flat, with a waved margin, once twisted at the 

 base, rising from a roundish, hollow, warted tuber ; frond oblong, 

 deeply cleft into many linear segments. 



Laminaria bulbosa, Lamour. Ess. p. 22. Ag. Syn. p. 18. Lyngb. Hyd. Dan. 

 p. 21. Hook. Fl. Scot, part 2. p. 99. Ag. Syst. p. 271. Ag. Sp. Alg. 

 vol.i. p. 114. Grev. Alg. Brit. -p. 29. Rook. Br. Fl. vol. ii. p. 271. Harv. 

 in Mack. Fl. Hib. part 3. p. 171. Harv. Man. p. 24. Wyatt, Alg. Damn. 

 no. 4. 



Laminaria Belvisii, Ag. Sp. Alg. vol. i. p. 115. Ag. Syst. p. 271. 

 Saccorhiza bulbosa, Be la Pyl. Fl. Ter. Neuv. p. 23. /. Ag. Sp. Alg. vol. i. 



p. 137. 

 Haligenia bulbosa, Dne. Fss. p. 50. Endl. 3rd. Suppl. p. 27. 

 Phycocastanum bulbosum, Kiltz. Phyc. Gen. p. 346. 



Fucus bulbosus, Huds. Fl. Angl. p. 579. Linn. Trans, vol. in. p. 153. Turn. 

 Syn.y. 212. Esper, Ic. 1. 123. E. Bot. 1. 1760. Turn. Hist. 1. 161. 



Fucus polyschides, Light/. Fl. Scot. p. 936. With. vol. iv. p. 97. Stack. 

 Ner. Brit. t. 4. 



Fucus palmatus, Ginel. t. 30. 



Ulva bulbosa, DC. Fl. Fr. vol. ii. p. 16. 



Hab. On rocks at low- water mark, and to the depth of 10-15 fathoms. 

 Perennial. Autumn. Abundant on the British shores. 



Geogr. Distr. Shores of Europe from Norway to Spain. Ferroe Islands. 

 Coast of Guinea, Pal. de Beauvois. 



Descr. Root, in the young state of the plant, composed of several clasping 

 fibres, gradually perishing as the frond increases in size, and its place sup- 

 plied by a hollow tuber which originates at a higher point on the stem. 

 Stein at first slender and filiform, half a line in diameter and an inch in 

 height, with a small dilatation like a collar a little above its middle ; grad- 

 ually becoming broader and quite flat, till, in large specimens, it is four or 

 five feet long, and two or three inches wide, with the margin very much 

 waved and curled. In these full-grown specimens, the collar-hke swelling 

 becomes dilated into a hollow tuber, from four inches to a foot in diameter, 

 rough with wart-like or cylindrical fibrous projections. The portion of the 

 stem below the tuber is either absorbed or perishes, and roots issue from 

 the lower surface of the tuber to supply the place of the original hold last : 

 thus a new base is provided for the frond. Frond in young specimens 

 membranaceous, oblong, or ovate, undivided ; when full-grown coriaceous, 



VOL. III. B 



