24 Rhodora [JANUARY 
figs. 110-112, 1882; De Toni, Syll. Alg., Vol. I, 124, 1889. Frond 
lanceolate or linear-lanceolate, simple, 1—5 dm. long, 1-20 cm. broad ; 
stipe short, hollow; upper part of the frond flat, the membranes 
grown together, as in U/va, except at the edges, where they remain 
free. Plate 42, fig. 8, cross section of margin. 
Forma cRisPATA, edges much crisped and folded. 
Forma LANCEOLATA, edges even or plicate, not crisped. 
These two forms are taken as defined by Agardh, l. c., and in one 
form or another this species seems common along the whole Atlantic 
coast from Maine to Florida, and is reported on the Pacific coast 
from Bering Straits to Santa Barbara, Cal. It grows on stones, 
woodwork and other algae, usually in places seldom or never left 
bare by the tide. The smaller forms look like forms of Æ. znfesti- 
nalis, but in the latter the frond, though often collapsed, is tubular 
throughout; in Æ. Linza the two membranes adhere, except at the 
edges, where there is a narrow open space, around which the cells 
are arranged, in cross section nearly in a circle. Europe, West Indies, 
Brazil, Peru, Tasmania. Kjellman (2) 53. Collins (7) 245 ; (8) 44. 
Saunders (1) 410. Ulva Linza Post. & Rupr. (1) 21. Hooper (1) 
3o. Harvey (1) 59; (2) 176. Kemp (1) 41. Farlow (1) 292; (2) 
379. Hall (1) 112. Anderson (1) 218. Fowler (1) 48. U. Entero- 
‘ morpha var. lanceolata Farlow (4) 43. Pike (1) 106. Hay & MacKay 
(1) 63. Collins (3) 310. Dame & Collins (1) 157. Bennett (1) 95. 
Britton (1) 400. Martindale (1) 92. U. Zatissima var. Linza Hervey 
(1) 53. Exsicc. Phyc. Bor.-Am., 16, 967 ; Amer. Algae, 384. 
8.4E. MINIMA Nag. in Kütz., Sp. Alg., 482, 1849; J. G. Agardh, 
Till "Alg. Syst., part 3, 135, 1882. Frond r-ro cm. long, 1-5 mm. 
broad, simple or slightly proliferous, soft and delicate, membrane 
8-10 y thick, cells angular, 5—7 » diam. arranged in no definite order. 
Plate 42, fig. 9, surface; fig. 10, cross section. 
A small species, resembling Æ. compressa, but smaller in dimen- 
sions of fronds and size of cells. It is probably common, but is 
easily overlooked among the larger and better known species of the 
genus. ‘The extreme thinness of the frond gives it a very soft and 
delicate feeling to the touch, which is the best character by which 
to recognize it when growing. It seems to grow mostly in the lower 
half of the litoral zone. At Southwest Harbor, Mount Desert 
Island, Maine, it grew in abundance on woodwork of weirs, etc. ; 
at Spectacle Island, Penobscot Bay, on rock; at Bridgeport, Conn., 
on rocks, Fucus, Spartina, etc., on a muddy shore; at San Francisco, 
California, on rocks at high water mark. Found also at Vancouver 
and Alaska; North Atlantic, Mediterranean, South Pacific. Collins 
(5) 458; (8) 44. Æ. intestinalis var. minima Rosenvinge (1) 959: 
(2) 159. Exstcc., Phyc. Bor.-Am., 468, 912. 
Forma RivULAR!s Collins, has a pale color, fronds half a meter in 
length, and substance more gelatinous than the type. ‘These differ- 
