IV. 
LAMINARIACEflE. — Costaeia. 
89 
The masses of fructification are reddish brown, much thicker than the leaves in 
which they lie. 
2. Alakia Pylaii , Grev. ; midrib solid, scarcely wider than the stipes, lamina 
cuneate at the base, decurrent along the stipes for a considerable space ; pinnai 
obovato-spathulate. J. Ay. Sp. Alg. vol. 1, p. 143. Kiitz. Sp. Alg. p. 579- 
Laminaria Pylaii , Bory. De la Pyl. FI. 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 pinnae ; 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 ; pinnae linear, 
rounded at the apex, attenuated at base, sessile.” — Post, and Pup. Illustr. p. 11, t. 16. 
Hab, Illuluk Bay, Unalaschka, Postells and Puprecht , l. c. 
4. Alaeia marginata, Post, and Pupr. ; “ Midrib solid, rather broad ; lamina thin 
but leathery,” (chartaceo-coriacea) ; “ pinnae linear, rounded at the base and 
apex, stipitate, coriaceous, entire at the margin, plane, bordered by a shining stripe 
(fascia nitida cinctis).” — Post and Pupr. Illus.,p. 11. 
Hab. At Unalaschka, Postells and Puprecht, l. c. 
Y. — COSTARIA, Grev. 
Frond stipitate, undivided, flat, three to five ribbed, the ribs sub-parallel, radiating 
from the apex of the stipe. Fruit. . . . ? 
The stipe is simple, solid, flattened, and marked with numerous elevated longi- 
tudinal striae, and so continued through a simple, linear, or ovate lamina, that the 
striae 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 bullated, often 
perforated between the ribs, the perforations irregular. J. Ag. 1. c. 
N 
