484 KEY TO THE HIGHER ALGZ OF THE ATLANTIC COAST. 
8. Forming globose, rigid, dark brown tufts on Fucus nodneness 
y joints mostly short, with a dark central spot 
8. Small, orb full red, distichous, many times pinnate, smith subu- 
i late pinnules å ot 
s. With none of the seve couitnaitone ‘of ene cte Sart 
t. Dichotomous or zigzag; bright purplish, inca i panah d 
t. Densely tufted; not dichotomous; full red; scarcely adhering et 
u. River mouths, etc., sometimes in fres ee 
Y. e red, closely m to paper siagon 
w. Shallow water, etc. ; adheres to fiiia vari ‘able, ae 
x. Lurid vada green when exposed: white when ' eacha so 
a Others probably occur; A ane ney mentions No. a 
on the Mass. said by Mr. Bicknell ih ia Ke : 
pA 3 Brillignt, very delicate ; grt close] pie: T 
y ; 
B.? Fronds like oak-leaves; pinnatifid or sinuate; rie watan n 
B.* Alternately or dichotomously sialic roseate, > + ce 
B.? Frond undivided, proliferously brane from the mien ie 
B.? Frond dichotomous; constricted, sean, jointed at the n M 
rooting or ETPA at the forks; die trok ka 
c. ? Frond somewhat rigid; sori oblong, - e 
C.? Frond soft, thin, flaccid; ie round, IRER 
D.? Dark red-purple; apices sometimes cirrhous, ee 
EB. Much divided; — Aia ee cad vi UAM 
F. Purplish; rather rigid, . EEE E s 7 
G.” Dark or eee Bo alien t to i DAGA) para r 
H.? Branches which eat r tetraspores, pod-like in pe ‘miale, m 
I. Very dark red- brown; does not adhere to piy Kii , 
J. Red-black; margin paler, . . * ‘ 
K.? Dull purplish, adhering to paper, . og tetera 
L.” Rosy red; level-topped; tender, . a E E 
M. Tetraspores in cloudy pat tches ; arge; n iu AE 
M.? Tetraspores in distinct sori i Su rare, cords w e E 
O.’ Lower branchlets entire; upper poci 3 
Pe Livia purple; sometimes compressed; s densely t ‘tufted: i 
2 a a? of the 
r red, 
Q. 2 inmate forming dark Aaaa convex = patches a at the i 
of the laminæ; dull red, i e 
R.? Compressed ; segments forked at re boci a S 
R. Flat; axils very much rounded, vuoan An 
8.’ Densely tufted; wiry; does not sisia 
T.? Fruiting branches mostly tapering to paih: excessive . 
tred; palmate; rare, > . i . 
mous, 
W.? Often iridescent; greenish’ in shallow water f and bl 
white; sori purplish, like drops of blood; pe 
X.? Much diyaricate ; branches tubular, , 
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