22 Rhodora [JANUARY 
\vinge, (1) 960; (2) 158; (3) 118. Collins (8) 44. Saunders (1) 
411. Exsicc. Phyc. Bor.-Am., 610,913 ; Amer. Algae, 127, 264, 265 
(as Æ. compressa), 128 (as E. clathrata), 385. 
Var. ARCTICA (J. Ag.) Rosenv. (1) 960; (2) 158. E. arctica, J. G. 
Agardh, Till Alg. Syst., part 3, 124, Pl. IV, figs. 100-102, 1882; 
De Toni, Syll. Alg., Vol. I, 120, 1889. Cells smaller and rounded, 
membrane 20-30 p thick, cells 10-14 m in cross section, usually 
longer than broad, sometimes double their breadth. Occurs Green- 
land to Spitzbergen. 
Var. TRABECULATA Rosenv. (1) 961, fig. 55; (2) 159, fig. 55. 
Slenderer than the type, with long capillary branches; the central 
cavity traversed by transverse and oblique “trabeculae.” Greenland. 
Var. TUBULOSA (Kütz. Reinbold, Chlorophyceen der Kieler 
Fohrde, 117, 1889; Æ. tubulosa, J. G. Agardh, L c., 128, 1882; De 
Toni, l. c, 122, 1889. Slender, slightly branched, of nearly uniform 
size throughout. In ditches in salt marshes, Revere, Mass. ; Great 
Salt Lake, Utah; Baltic and German Seas.  Exsicc. Phyc. Bor.- 
Am., 471; Amer. Algae, 262. 
s. E. salına Kütz., Phyc. Germ., 247, 1845; De Toni, Syll. Alg., 
Vol. I, 136, 1889. Frond ap Iu tubular, with a few branches, 
which are sometimes opposite, of two or more rows of cells, or in the 
youngest of a single series; cells quadrangular, 14-16 p square, or 
slightly longer than broad, in longitudinal series throughout ; mem- 
brane thickened on both sides. 
The slender fronds with relatively large cells in longitudinal series 
distinguish this species with tolerable distinctness from any others 
within our limits. . It was found by De A. Saunders at Lake Pont- 
chartrain in Louisiana, and by Mrs. Curtiss in Florida. Found in the 
Baltic and near salt mines in the interior of Europe. Exsicc. Phyc. 
Bor.-Am., 859. 
Var. POLYCLADOS Kütz. Phyc. Germ., 246, 1845. Filaments 
beset with more or less numerous short, horizontal, spine-like ramuli. 
Occurring in a brackish ditch at Key West, Florida ; collected by 
Farlow. 
drying, below densely branched, branches ascending, somewhat dilated from a 
narrow base, simple, long, apparently lingulate; cells subquadratically rounded, 
forming longitudinal series through nearly the whole length of the frond; endo- 
chrome rounded, occupying nearly the whole space of the cell. Atlantic shores 
of Europe and America; in the Gulf of Mexico." i 
The above is translated from the original description; the species does not 
appear to have been recognized by American algologists. At Marblehead, Mass., 
a form occurs which agrees very well with the Æ. /ingulata of Hauck, in Phy- 
cotheca Universalis, No. 14; but Bornet, comparing this with an authentic spec-` 
imen from Agardh, considers Hauck’s plant to belong to a different species. See 
Bornet, les Algues de P.-K.-A. Schousbóe, p. 199. It is possible that Agardh's 
plant may have been included here in Æ. prolifera; there is no very sharp line 
drawn in the descriptions. 
