61 SYNOPSIS OF BKITISTT SEAWEEDS. 



tlio frond is twenty inches in length, and the lateral branches 

 from six to fourteen inches long; and Dr.Greville informs 

 me thai some of his specimens are of equal size. Nothing 

 can well exceed the beauty of Buch plants, as they wave 

 freely in the water. Though the common forms of ll.lyco- 

 podioides seem to lie very different from i?. subfusca, spe- 

 cimens are sometimes found which have an intermediate 

 character. The latter is usually a much more branching 

 plant, and is generally found attached to rocks, and its 

 ramuli are much less dense. The microscopic structure 

 in both is very similar. I must conclude by entering a 

 protest against the substitution by Kiitzing of his name 

 Lophura. 



100. subfusca {The brownish Rhod 'omelet)-, frond filiform, much 

 branched ; the branches irregularly divided, clothed with pin- 

 nated branchlets, and subulate, simple, scattered or fascicu- 

 late ramuli ; pinnules subulate ; tetraspores contained either 

 in the somewhat swollen ultimate ramuli (in summer), or in 

 proper brandling stichidia (produced in winter), Ag. Sp. Alg. 

 v. 1. p. 378. (Atlas, PL XXIV. Fig. 103.) 

 Lophura cymosa, Kiitz. Gigartina subfusca, Lamour. Sphrero- 

 coccus subfuscus, Hook. Fucus subfuscus, Woodw. F. con- 

 fervoides, Huds. F. variabilis, Good, and Woodw. F. se- 

 taceus, Widf. 

 Hab. On rocks and shells, in pools between tide-marks ; some- 

 times on the larger Algae. Biennial or perennial. Spring 

 and summer. Generally dispersed round the coast. 

 This plant is so different in appearance when collected 

 in summer and in winter, that it may well be taken by the 

 young botanist for two. The summer specimens are well 

 clothed with slender, multifid, and soft ramuli, which 

 lengthen as the season advances, and drop off before win- 

 ter, leaving bare stems rough with broken stumps. The 

 tetraspores are found either in summer or in winter. At 

 the former season they are simply immersed in the termi- 

 nal ramuli ; at the latter they will be found lodged in small 

 branching stichidia scattered irregularly along the sides of 

 the branches. Except in its much more bushy and branch- 

 ing habit and paler colour, there is a very close resemblance 

 between this and the preceding species. 



XXXYIII. BOSTRYCHIA. 

 101. scorpioides {The scorpioid Bostrycltia) ; frond filiform, 



