482 
KEY TO THE HIGHER ALGZ OF THE ATLANTIC COAST. 
Sem ei in definite sori; frond flat, with a berg: e AUi 
Frond flat, without a midvein; spores n ‘ 
Delicate, rosy red; lamina unbranched; no bes ota $ 
Grin nellia. 
Fronds with veins and veinlets or else branched, . Delesseria. 
Frond compressed in our species, laciniate, . . Gracilaria. 
Frond flat, laciniate, delicate and rosy, often veiny, Nitophyllum. 
Frond flat, leathery, margined with wing-like segments, Pc 
Calliblepharis 
Frond slightl b hlet ler at base, Gelidiu 
Coarser; cylindrical; succulent and flaccid, Solieria. 
Frond filiform, much branched; branches clothed with m 
ointed branchlets s 
Dark brown, eketia not ‘adhering ió jaen : Po ides 
Suborbicular; red-black, . Peyssonnelia. 
Regularly äickotomiois and irii “topped, Vo. 
Sparingly dichotomous; worm-like, a el e N 
Frond flat, fan-shaped, multifid, ey i 
Frond linear, two-edged, pectinate- -pinnatifid, . Ploca 
Frond terete, alternately decompound, » Oe rye 
Frond stipitate, palmately cleft; usually ares and dark, - 
Rhodi 
Roseate; dichotomously or seat multifid, . Euthora. 
More or less flattened or compressed, eca m ee 
Cylindrica 
nde stipitate, panen pene shaped, vey variable in clo an 
Cho 
Friot Asiera irregulariy. cleft, pikro dos heir 
Phyllophora. 
Channelled on one side, convex on the other; covered with little 
tubercles Pi frondlets, Cigera® 
Frond rigid, 2 to 3 dabos high; ‘Molen ss rounded; 
apices ett t, mnogo T 
Frond 1 to 2 feet wagi ikari fringed, with siaii doa 
Grateloupia. 
Frond broad, palmate, fringed with cilia; brilliant. pre 
Frond stiff, very rigid and horny; axils rounded, . 
TR very bushy; branchlets with a chain of pis "odes 
ontaining conceptacles, or else tendril peee s a 
: şa 
AAR we 4 2 ee ae and end te 
intl 
Frond delicate, much branched, scoala ewe to pares 6 ne 
nia. 
osipho 
Not as above, aut Sele oe ola 
Frond hollow, simple or eis sista hollow erent eri 
, p. Halo ai r 
y second a 
Branchlets mostly opposite and tapering to base; ; usuall 
or arching, stem constricted, adheres to paper, Chy Chylo 
