56. 
57: 
58. 
59. 
60. 
61. 
140 
Thallus irregularly ree of extreme wiriness.; almost 
black in colour aS nde .. Ahnfeltia ...p.82 
Plant not rigid, emcee Saree -red, much branched, aig 
bushy tufts 4-18 inches long ... bn eA 5 - 57 
Suge attached to the substratum by branched eee 
“yootlets’’; reproductive rogans in swollen terminal 
branches ; opnaspoies zonately divided Furcellavia ...p. 101 
Plant attached by compact basal disc; reproductive organs in 
wart-like swellings developed laterally on the thallus 
Polyides ...p. 101 
Thalius dichotomously branched in one plane, forming compact 
tufts 2-4 inches high; tetraspores cruciately divided 
Gymnogongrus ...p. 81 
Much branched plant with medulla composed of longitudinally 
elongated filaments ; tetraspores zonately divided 
Cystoclonium ...p. 82 
Plant with medulla of large colourless cells not elongated as 
hyphae; tetraspores cruciately divided ... Gracilaria ...p.84 
Thallus more or less pinnately divided ... Laurencia ...p2e@ 
Plant of extreme leatheriness of texture; bright red in colour, 
forming single (or few) spoon-shaped blades, 2-6 inches in 
diameter, attenuated towards the base Sse Dilsea ...p.100 
Thallus of tough texture, dark in colour; irregularly pinnate, 
or lanceolate with strap-shaped or filiform emergences 
arising on the margins ... dis aS oso aes wos 3O 
Thallus more or less perfectly dichotemore a oe ~a51, MOD 
Small plants with fronds 1-3 inches long, dark in colour; younger 
parts of the plant in section show a central group of elongated 
cells a is Geliidium ...p. 80 
Thallus soneistme af a etalleed tide 2-7 inches long with 
a series of filiform appendages half to three-quarter inch long 
arising from the margin ; tetraspores zonately divided 
Calliblepharis ...p.84 
Thallus with medulla of interwoven threads, giving off obliquely 
ascending filaments, from which arises a cortex of radially 
arranged filaments; cruciately divided tetraspores not in 
nemathecia . : . OM 
Thallus with a maeticllla of eee, foacely, pacized alle aml onal 
celled cortex ; tetvaspores in nemathecia Phyllophora ...p. 81 
Thallus dichotomously branched, very variable in width and 
in texture, spreading out into fan-like expansions ; cystocarps 
embedded in the frond =, 3 .. Chondrus” =sp28e 
Thallus not dichotomously pemened.- tips of the fronds 
expanded somewhat suddenly into more or less triangular 
blades ; cystocarps in special papillate emergences arising 
from the distal expanded portions of the thallus, more 
numerous on one side than the other w= Gigavunad ~,..pl0% 
