Ser. MELANOSPERME^E. ( 57 ) Fam. LAMINARIiE. 



Plate CL. 

 LAMINAEIA PHYLLITIS.— i:«;;?o^^r. 



Gen. Char. — Frond stalked, coriaceous or rarely membranaceous, flat, without a midrib. 

 Fructification : spores collected in spots or sori under the surftice of some part of 

 the frond. Name from lamina, "a thin plate." 



Laminaeia phi/llitis. — Frond small, delicately membranous, simple, 

 arising from a short " subcompressed " stem, lanceolate, with a narrow 

 tapering base, and crispied margin. 



Laminaeia phyUitis. — Lamour. Ess. p. 22 ; Lyngh. Hyd. Dan. p. 23 ; A<j. Sp. 

 Alg. vol. i. p. 121 ; A(j. Syst. p. 273 ; Spreng. Syst. Veg. vol. iv. 

 p. 325 ; Grev. Alg. Brit. p. 34 ; Hook. Br. Ft. vol. ii. p. 272 ; Eiull. 

 3rd Suppl. p. 27; Kiltz. Phyc. Gen. p. 345 ; Earv. in Mack. Fl. Hih. 

 part 3, p. 171 ; Harv. P. B. plate 192 ; Harv. Man. p. 31 ; Ilarv. Syn. 

 p. 28 ; Atlas, plate 8, fig. 29 ; /. G. Agardh, Sp. Gen. Alg. vol. i. p. 131. 



Laminaeia saccTiarina (young state). — Hooh. Fl. Scot, part 2, p. 98. 



Laminaeia saccharina, var. attenuata. — G^'ev. Fl. Edin. p. 282. 



•FucTJS phylUtis.— Stack. Ner. Brit. t. 9 ; Turn. Syn. p. 193 ; Turn. Hist. t. 164 ; 

 E. Bot. t. 1331 ; Esper, Ic. t. 149. 



Fucus phyllitidis folio. — Raii Syn. p. 40. 



Hab. — On rocks and stones in tide-pools, as well as in four to six fathoms water. 

 Perennial. Summer. Not uncommon. 



Geogr. Dist. — Atlantic shores of Europe. 



Description. — Root comi^osed of a few sparingly -branched slender 

 fibres. Stem short, from half an inch to an inch in length, and from 

 one-fourth to half a line in thickness, gradually widening into the frond, 

 which is slightly widened to the middle, then tapering to the apex, 

 which is rather acute when entire, but like all the other species of the 

 genus, generally more or less eroded and obtuse ; mostly smooth and 

 plane in the middle, always more or less crisped on the edges, from six to 

 ten inches or more in length, and from half an inch to an inch in breadth. 

 Structure consisting of " a double stratum of large air-cells, whose walls, 

 as well as the sm-faces of the frond, ai'e composed of minute cellules." 

 Substance delicately membranous, but firm, and not very perfectly 

 adhering to paper ; generally least so in the upper part of the frond. 

 Colour, a fine delicate olive green when young ; when older, more 

 brownish yellow ; generally tinged with brownish red at the base. The 

 fructification we have not seen, and believe it to be unknown. 

 VOL. in. I 



