LAMINARIACEAE 55 
PLATE 13, FIGURES 10-20. Мууіосіайіа grandis 
10. Cross sections of the thallus (from fluid-preserved material). 
Ii X buo of РОР filaments, with sporangia. 
12. А part of a “major” assimilatory ee near its base. 
13. Cells 4 the same filament near its 
14. Apical portion of a MIN filament. 
15. Base of a “major” filament, wath sporangia. The walls of many emptied 
sporangia persist and the large sporangium shown is still surrounded by the 
walls of a previous sporangium which it has replace 
me 
17. Sporangia in various stages of development. The emptied sporangium at the 
right is being regenerated or refilled from its base; the lowest cell shown 
has the pee and remains of three sporangia subverticillately arranged. 
18. Bases of a “major” and а “minor” filament, the former bearing а group of 
sporangi 
I9, 20. Abnormalities or possibly abortive or immature plurilocular sporangia. 
All of the figures are drawn from the type material (Апсбп, Coker 93). The 
figures marked то are enlarged 2 diameters; тт, 55 diameters; 12—20, 345 diameters. 
Family LAMINARIACEAE 
.EISENIA Aresch. Bot. Notis. 1876: 68. 1876; Obs. 
Phyc. 5: 7. 1884 
Eisenia Cokeri sp. nov. 
Gregarious; holdfast about 4-20 cm. in diameter, of compactly 
interlaced hapteres, these apparently without muciferous canals; 
stipe 2.5-9.5 dm. long, compressed-terete and 1-2 cm. broad at 
base, soon becoming more distinctly flattened and 1.5-3.0 cm. X 
0.5 cm. above, solid, almost destitute of muciferous canals; pri- 
above, once pinnate, the pinnae 6-8 on each margin, mostly rather 
closely crowded near the broadly canaliculate, cucullate or con- 
cavo-convex base, the 3 or 4 lowest (youngest) on each side sub- 
terete or ligulate, the succeeding 3 or 4 linear with narrow long- 
cuneate bases and gradually increasing in width to near their 
apices, 30-60 cm. long, 0.5-1 cm. wide below, becoming 1.5-4.5 
cm. wide above, the highest pinnae short and subfalcate, 2-7 cm. 
long; primary lamina finally replaced by two flattened and often 
twisted crura mostly 2-25 cm. long and 1.5-5 cm. broad, each 
terminated by a subreniform commonly ruffled and twisted expan- 
sion 4—7 cm. broad and bearing 12-50 crowded sporophyls, these 
becoming 1-9 dm. long and 3-6 cm. broad from narrow long-cun- 
eate bases, simple, or occasionally furcate, or rarely with one or 
two short lateral branches, 1-1.3 mm. thick near base, 0.3-0.55 
