ary: 
1903 ] Collins, — The Ulvaceae of North America 21 
from Æ. intestinalis. It occurs on both shores of the Bering Sea. 
Kjellman (2) 52. 
3. E. rLExvosa (Wulf.) J. G. Agardh, Till Alg. Syst., part 3, 126, 
1882; De Toni, Syll. Alg., Vol. I, 121, 1889.  Frond cylindrical, 
tubular, simple, tapering to a filiform stipe below, above inflated, 
flexuous and intestine-like ; cells 6-8 x 8-12 p, roundish polygonal, in 
longitudinal series; membrane somewhat thickened on the inside; 
chromatophor filling the thick walled cell. Plate 42, fig. 3, surface. 
This is a southern species, and on our Florida shores appears to 
take the place of Æ. intestinalis in the north. From the latter it 
differs in having somewhat smaller cells, arranged in regular series ; 
also somewhat more delicate membrane. From Æ. compressa it is 
also distinguished by the arrangement of the cells, and its habit is 
dissimilar ; from both these species it differs in having a thicker wall 
between the cells. It seems to be common in Florida, and occurs on 
the west coast at Santa Barbara and San Diego. Warmer temperate 
regions of the world. Exsicc., Phyc. Bor.-Am., 462. 
4. E. PROLIFERA (Fl. Dan.) J. G. Agardh, Till Alg. Syst., part 3, 
129, Pl. IV, figs. 103 and 104, 1882; De Toni, Syll. Alg., Vol. I, 122, 
1889. Frond up to several meters long, and 2 cm. diameter, tubular or 
compressed, with more or less abundant proliferous branches, which 
are usually simple, but sometimes also proliferous; branches varying 
much in length and diameter; cells ro—r2 p, in the younger parts 
_ always arranged in longitudinal series, which become less distinct in 
the older parts; membrane 15-18 y thick, not much exceeding the 
dimensions of the cells in cross section. Plate 42, fig. 5, surface. 
A common species, formerly included in Æ. compressa or Æ. intest- 
inalis, to the former of which it is most allied, but from which it 
differs in the longitudinally seriate cells, very manifest in the younger 
portions, and disappearing only in the quite old parts. In habit it is 
very variable, from slender, slightly branched forms, only a few cm. 
long, to richly and repeatedly branched fronds; branches sometimes 
long and slender, sometimes short and very densely set, sometimes 
long and short intermingled quite without order. In one form there 
is a stout main stem, from which smaller proliferous branches issue 
at nearly right angles, reminding one of some coniferous trees, It 
appears to prefer somewhat sheltered localities, where it is not left 
bare for any considerable time at low tide. It is reported from 
Greenland, and as far south as New Jersey; as Agardh reports it 
from the West Indies, it probably occurs along the whole Atlantic 
coast. It has been found only at Alaska on the west coast, but prob- 
„ably occurs at other localities. It occurs in brackish water in South 
Dakota, (Saunders) and in fresh or very slightly brackish at Los 
Angeles, California, (Miss Monks). It is found along all the shores 
of Europe, and in fresh water in several European countries! Rosen- 
1 E. LINGULATA J. G. Agardh, Till Alg. Syst., part 3, 143, 1882. “Tufted, 
grass-green, delicately membranacous, tubular, membrane somewhat collapsing in 
