KEY TO THE HIGHER ALGZ OF THE ATLANTIC COAST. 
483 
eee 
% 
oa a ao 
ee ee 
T 238 
C. — aiia topped, dichotomous; axils and apices acute; ends 
swollen into pod-shaped tn ie . Furcellaria. 
d. Frond poms constricted at the nodes, . Griffithsia. 
d. Frond two edged, decompound eee pia opa, Ptilota. 
d. Frond filiform, ` 
@. Tetraspores konk in ihe Goih: ante iotatid: broches dichots: 
mous and commonly ending in little forks, which are often 
incurved; eiar ainsa ee Cer 
©. Tetraspores external; much branched; rarely dichotomous or ` 
with the apices hooked Callithamnion. 
e. Tetraspores external; whorls of stork; oirro branchiets at the 
nodes, a a a Gea ae Š alurus. 
f. Surface eiaiaed with iiaii cella i ne sins 
g. Pinnately decompound; axils yhtn apices al acute, 
h. Branchlets club-shaped, obtuse, . . i heh 
BY Branchlets acute at eachend, < 2.6) 1. we 
i... Stem stout, mostly excurrent, . . 9.0. 6 2 ee ee 
i, Slender, generally forking near base, eit E et 
j. Frond slender, with setaceous brinchlets pi ete Oe’ + 
j. Stout, with thick branchlets, eure 
k. Substance soft, closely siksna té paper; : ace 
k. Rather rigid; scarcely adhering to paper, = ro 
l. Brownish red, pinnately much branched, ie 
l. Rosy, staining paper; more slender and regulary pinnate gre 
ee ee os 
m. Primary tubes 6 t eee 
n. Visibly articulate seat : dbaectiaits pallúcid; ets 
n. Stem and larger branches apparently not jointed, . 
0. Branches widely spreading, beset — re branchlets, 
O. Branches not spinous nor divarica 
P. Rigid and bushy; not — ia drawn: foti the vents 
joints rt, . 
P. Flaccid and silky ; joints wapin T eae es 
q. Dark; tips with tufts of rome fibrils “ 
q. Fu red; in small dense tufts or onde which sins © closely to 
p . 
q. Coarser; eon Linsey tufted ; wares adher ing, 
T. Red brown; branches long, twig-like, sometimes with Sancti of 
fine rosy branchlets; stem scarcely adhering to paper, 
r. Dull, brownish; tips fibrilliferous; joints striate; tiaras % 
paper, ie 
r. Brighter eclored, « more bennéloet sii with longer "joints, I 
8. Pivnately much branched, — jointed; branches mostly 
naked below and pinnate above; blackish; substance rigid 
wiry, not adhering pasi to paper; excessively varia- 
bo 
8. 
Internodes bag: branches feathery Å" the tips; adir to 
Paper; a deep water variety. of No. 73 (?) . ; 
