1903] Collins, — The Ulvaceae of North America 29 
mania, New Zealand. Harvey (1) 57, in part. Farlow (1) 292 ; (2) 
712: (3) 379. Robinson(1)166. Hervey (1) 51. Kjellman (2) 52. 
Britton (1) 4or. Collins (7) 246: (8) 44. Ulva clathrata Farlow 
(4) 44. Collins (3) 310; (6) 78. Dame & Collins (1) 157. 
Martindale (1) 93. 
Forma rostrata LeJolis, Algues Marines de Cherbourg, 50, 1863. 
Fronds densely branched, prostrate, often matted. In salt marshes 
near Boston, Mass. Uwa clathrata var. prostrata Martindale (1) 
93. Britton (1) 401. U.clathrata var. Rothiana f. prostrata Farlow 
(4) 44. Dame & Collins (1) 157.  Exsicc. Phyc. Bor.-Am., 459; 
Alg. Am.-Bor., 215. |j 
18. E. RAMULoSA (Eng. Bot.) Hook., British Flora, Vol. II, 319, 
1833; J. G. Agardh, Till Alg. Syst., part 3, 154, PI. IV, figs. 117, 
118, 1882; De Toni, Syll. Alg., Vol. I., 134, 1889.  Frond tubular, 
rather stiff, much branched; branches with short spine-like ramuli ; 
cells rather rounded, showing longitudinal series only in the ultimate 
divisions. Plate 43, fig. 6, tip of branch. . 
A coarse species, readily recognized by its habit. It appears to 
be not uncommon along the southern part of the Atlantic coast, but 
rare in New England. The color is usually a rather deep or dark 
green; the main branches are often quite long, and are everywhere 
beset with short tapering ramuli; the cells are rounded. almost en- 
tirely occupied by the chromatophor; without any definite arrange- 
ment except in the ramuli. Europe, Australia, New Zealand. Collins 
(8) 44. £. clathrata var. ramulosa Kemp (1) 41. Ulva clathrata 
var. ramulosa Farlow (4) 44. Collins (3) 310. U. clathrata var. un- 
cinata Martindale (1) 93. Britton (1) 401. 
19. E: ACANTHOPHORA Kiitz., Sp. Alg., 479, 1849. J. G. Agardh, 
Till Alg. Syst, part 3,157; De Toni, Syll. Alg., Vol. I, 135, 1889. 
Frond more or less proliferously branched, the branches usually 
somewhat enlarged upward, beset with numerous short, spine-Eke 
ramuli, with broad base and acute tip, cells 6-8 p diameter, roundish 
angular, showing no longitudinal arrangement except indistinctly at 
the tips of the ramuli, Plate 43, fig. 5, tip of branch. 
somewhat resembles Æ. ramulosa, but the cells are much smaller, 
with hardly any indication of longitudinal arrangement; the sub- 
stance is less firm, and the color is lighter. The fronds seem to 
collapse irregularly in. drying. ‘The spine-like ramuli vary in abund- 
ance, sometimes almost covering the frond; the 1eeular branches 
are not very numerous, and seem quite distinct from the ramuli. It 
occurs on the California coast (Brandegee). and is one of the few 
species that occur also in fresh water, having been collected by Miss 
S. P. Monks in the Santa Pau!a mountains, California. at an altitude 
of over 300 meters, and by Miss G. R. Crocker in Alameda Creek, 
California ; West Coast of South America, New Zealand and Tasmania. 
Exsicc. Phyc. Bor-Am,., 515. 
