402 KEY TO THE HIGHER ALGZ OF THE ATLANTIC COAST. 
w. Branches py short, tht horizontal, espa branchlets. 52 
w. Notas above; long, loose and feathery. . 
x. On Chorda, po ae OR a Stem Sekliows.: eke Boe | 53 
LIST OF SPECIES. 
In the following list the distribution of each plant is given, as 
far as known. The figures refer to the average height of the 
plant in inches. 
1, SARGASSUM* VULGARE Agardh (Sea-Lenfils). Cape Cod ome PR 12-36. 
2. SARGASSUM MONTAGNEI Bailey. Rhode Island and Sout 
3. SARGASSUM BACCIFERUM Agardh. (Sea-grapes, Gu ulfaeed.) "oat Stream. 12-40. 
4 12-2 
R ; 
HALIDRYS SILICULOSA gby. Newfoundland. 10-0, 
. Fucus on Lin nnæus. ea vaig a North. 
orie 
10. FUCUS SERRATUS Linnæus. ea abe sist Forth 24-40, 
11. ARTHOCLADIA VILLOSA Duby. North Carolina 
2. DESM. STIA VIRIDIS ppe New York Epea North. 12-36. 
13. DESMARESTIA ACULEATA Lam x. New Jersey and North. 12-80. 
14. LAMINARIA SAOUHARINA Lamoronx. ( Venus’ Girdle.) Cape May rape N. 12-120. 
15. LAMINARIA DIGITATA I weed). Long Island and North. 40-144. 
16. LAMINARIA LOREA Bory. Newfoundland. 24-60. 
17. LAMINARIA LONGICRURIS De la Pylaie. peels iene a North. 60-100. 
Nort) 
22. CHORDA FILUM pre oan inny’s Lines). Cape May and North. 1 
23. CHORDA a ee abies rsa and North. 
24, STILOPHORA Agardh. New Jersey and North. 4-5. 
25. Diorrostrnox ra ræsIcVLACEUSI Greville. New Jersey and North. 6-24 
26. STRIARIA -A ATA Greville. New York. 2-3. 
29. PUNCT. 
30. ASPEROCOCCUS Grevill Diisel, 5-24. 
g CHORDARIA FLAGELLIFORMIS Agardh. New Jersey and North. 12-24. 
32. CHORDARIA DIVARICATA tag ta Long Island and North, 12-30. 
33. MESOGLOIA VERMICULARIS Agardh. Halifax. 12-18 
*More than 120 species of Sargassum have been described, many of ger? ae 
foes teas shed by indefinite or inconstant characters. Prof. Agassiz, who x i 
I , expressed his decided opinion that our eight 
“species” were merely fo forms z n. abe one and the same | 
Specimens with blended characters of Nos. I and 2 
tIn the AMERICAN arire api ye August, 1873, 
mine ofa specimen o! of Dicry ULACEUS grow 
either in observation or in identification, ee ‘would "a as pis 
long ago by Areschoug, that Dictyosiphon is merely an abnormal st: 
fagelliformis. 
