THE ALGAE OF BERMUDA. 83 



branching more or less dense, when dense often apparently dichoto- 

 mous, tips acute; sometimes fertile throughout, sometimes rachis or 

 even branches sterile. Fructification mostly on the upper part of 

 the axes, often occupying these to the exclusion of leaves and vesicles, 

 but also sometimes on short branches on the lower part of the axes. 

 Specially a plant of exposed shores. 



5. S. VULGARE Agardh var. FOLIOSISSIMUM (Lamour.) J. G. Agarclh, 

 1SS9, p. 10S; Fucus foUosissimus Lamouroux, 1813, p. 36, PI. VII, 

 fig. 1. Cooper's Island, April, Hervey. From a very short trunk 

 arise several main axes, mostly smooth, sometimes slightly muricu- 

 late, bearing more or less numerous similar branches; leaves lanceo- 

 late to oblong, the margins finely and closely dentate; midrib distinct, 

 cryptostomata abundant and without definite order on the younger 

 leaves, often obsolete on the older and thicker leaves; vesicles spheri- 

 cal, 3-5 mm. diam., without prolongation, on a pedicel equal to the 

 diameter or longer; receptacles axillary, branching, fertile through- 

 out, verrucose, shorter than the leaves. 



At Spanish Point, March, Hervey, was found a form probably 

 belonging here, but without fruit; the leaves are narrower and nearly 

 entire; it may be S. vulgare, typical; S. mdgare varies much in the size 

 and form of the leaves. 



6. S. FILIPENDULA Ag., var. Montague! (Bailey) comb. nov. ; 

 <S. Montagnei Bailey in Harvey, 1852, p. 58, PI. I. A; S. milgare var. 

 Montagnei Farlow, 1881, p. 103; S. Filipendula forma subedentata 

 J. G. Agardh, 1889, p. 120. Kemp; near Wistowe, floating, Aug., 

 Collins. Stem long, slender, filiform, smooth except for a few minute, 

 scattered papillae on the younger parts, loosely branched; leaves 

 linear, usually 3-6 mm. wide, up to 15 cm. long, often one or more 

 times forked, the divisions sometimes equal and symmetrical, oftener 

 subpinnate and alternate; leaves tapering gradually or abruptly 

 to the subacute tip; midrib' distinct throughout leaves and their 

 divisions; cryptostomata few, small, scattered, rarely showing a 

 linear arrangement; margin even or slightly undulate or indistinctly 

 dentate; vesicles spherical to subpyriform, 2-3 mm. diam., tipped 

 generally with a rnucro, often with a leaf; pedicel in length one and 

 one half to three times the diameter of the vesicle, sometimes filiform, 

 often compressed, or with midrib and margin. Rachis of fructifica- 

 tion filiform, smooth, sterile, elongate, bearing rather distant lateral 

 branches at first with sterile base, later fertile throughout, sometimes 

 with a second series of similar branches, all branches at right angles, 

 of uniform diameter, torulose; ultimate divisions up to 3 cm. long. 



