IV. LAMINARIACE.E.— CosTAEiA. 89 



The masses of fructification are reddish brown, much thicker than the leaves in 

 which they lie. 



2. Alaeia Pylaii, Grev. ; midrib solid, scarcely wider than the stipes, lamina 

 cuneate at the base, decurrent along the stipes for a considerable space ; pinnae 

 obovato-spathulate. /. Ag. Sp. Alg. vol. 1, p. 143. Kiitz. Sp. Alg. p. 579- 

 Laminaria Pylaii^ Bory. De la Pyl. Fl. Ter. Neuv. p. 29. 



Hab. On rocks near low-water mark. Newfoundland, De la Pylaie. (v. s. in 

 Herb. T.C.D.) 



Scarcely differing from the preceding, with which it has probably been sometimes 

 confounded. It is chiefly marked by the broader and more obovate pinnte ; the 

 cuneate base of the frond is a very indefinite character. 



3. Alaeia jistulosa, Post, and Rupr. ; " Midrib fistular, inflated, at intervals 

 constricted and septigerous ; lamina delicately membranaceous ; pinn» linear, 

 rounded at the apex, attenuated at base, sessile." — Post, and Rupr. Illustr. p. 11, 1 16. 



Hab. lUuluk Bay, Unalaschka, Postells and Ruprecht, I. c. 



4. Alaeia marginata, Post, and Rupr. ; " Midrib solid, rather broad ; lamina thin 

 but leathery," (chartaceo-coriacea) ; " pinnte linear, rounded at the base and apex, 

 stipitate, coriaceous, entire at the margin, plane, bordered by a shining stripe 

 (fascia nitida cinctis)." — Post, and Rupr. Illust. p. 11. 



Hab. At Unalaschka, Postells and Ruprecht^ I. c. 



v.— COSTARIA, Grev. 



Frond stipitate, undivided, flat, three to five ribbed, the ribs sub-parallel, radi- 

 ating from the apex of the stipe. Fruit . . . ? 



The stipe is simple, solid, flattened, and marked with numerous elevated longi- 

 tudinal strise, and so continued through a simple, linear, or ovate lamina, that the 

 stride of the stipe are produced in ribs. These ribs are three or five ; they are 

 united in the stipe ; separated, they run through the lamina sub-parallelly, and 

 approach again at the apex. The lamina is mostly wrinkled and buUated, often 

 perforated between the ribs, the perforations irregular. J. Ag. I. c. 



