FUCACEAE. 607 



Sargassum fluitans B0rg. is also found in a free-floating condition and is 

 another inhabitant of the "Sargasso Sea." It is a coarser plant than S. 

 natans, with broader leaves, these with shorter and proportionally broader 

 teeth and often with more obvious cryptostomata; its air-vesicles are shorter- 

 stalked, more numerous, often more nearly spherical, and they lack the apical 

 appendage which is often a conspicuous feature of S. natans; its stem is 

 roughened by short spinules or outgrowths, which are commonly lacking in 

 S. natans. (Phyc. Bor.-Am. 2177.) 



Sargassum Filipendula Ag. In the ponds of Walsingham and doubtless 

 elsewhere. The leaves show conspicuous cryptostomata and the stems are 

 smooth or nearly so. (Phyc. Bor.-Am. 2176.) 



Sargassum lendigerum (L.) Ag. is a name that has been applied by J. 

 Agardh and others to a Bermuda plant that is not uncommon on rocks a little 

 below low-water line. The lowest or first leaves are often forked and rarely 

 subpinnate, but most of them are simple, oblong or linear-oblong and dentate, 

 the cryptostomata are conspicuous, and the lower parts of the stem are often 

 much roughened by short irregular outgrowths; vesicles are often wanting. 

 The Linnaean type of the species was from Ascension Island, lying in the 

 Atlantic south of the Equator, and the current identification of the Bermuda 

 specimens is open to question. (Phyc. Bor.-Am. 2178.) 



Sargassum linifolium (Turn.) Ag., a name originally given to a Mediter- 

 ranean and Adriatic plant, has been used for a somewhat similar Bermudian 

 form. It is related to the foregoing species, but apparently differs in the 

 linear commonly subentire leaves, the upper of which as well as the lower are 

 sometimes forked. (Phyc. Bor.-Am. 2179.) 



Family DICTYOTACEAE. 



Spatoglossum Schroederi (Mert.) Klitz. occurs in the ponds of Walsing- 

 ham, in Hamilton Harbor, etc. The thallus in well-developed conditions reaches 

 a height or length of 5-8 inches; it is irregularly dichotomous, and its main 

 segments, which show no costa, are i-5 of an inch wide. Its margins are 

 irregularly toothed and often proliferous. The color of the younger parts is 

 an olive-green ; of the older, a fuscous or fuliginous brown. Small irregularly 

 scattered dark spots indicate the position of hair-clusters or of reproductive 

 organs. (Phyc. Bor.-Am. 2027.) 



Zonaria zonalis (Lamour.) M. A. Howe. (Fncus zonaJis Laniour. Diss. 

 38. pi. 25. f. 1. 1805; Dictyota sonata Lamour. Nouv. Bull. Sci. Soc. Philom. 1: 

 331. My 1809; Jour, de Bot. 2: 40. 1809; Zonaria lohata kg. Syst. Alg. 265. 

 1824; Stypopodium lobatum Kiitz. Tab. Phyc. 9: 25. pi. 63. f. 1. 1859.) 

 This is common on rocks in shallow water in rather exposed places along the 

 South Shore, where it is often found washed up on the beach. It grows in 

 large masses and is more or less bluish-iridescent when living and submerged. 

 The plants attain a height or length of about one foot; the thallus is repeatedly 

 cleft or lobed in a somewhat dichotomo-palmate fashion, the ultimate lobes 

 being cuneate, cuneate-oblong, or cuneate-flabelliform, and }-3 inch in greatest 



