418 
THE SEAWEEDS 
Order. 
Family. 
:4 Genus. 
r 
r 
' Calosiphoniaceae . . . 
Nemastomaceae 
Nemastoma, Schizymenia 
Sebdeniaceae 
Sebdenia 
Furcellari^ceae 
— 
Solieriaceae 
Solieria 
Rissoellaceae 
— 
Rhabdoniaceae 
Rhabdonia, Erythroclonium, etc. 
<< 
Rhodophyllidaceae . 
Rhodophyllis 
Gigartinales .... 
Hypneaceae 
Hypnea 
o 
« 
Plocamiaceae 
Plocamium 
W 
3 
Sphaerococcaceae . . . 
Stenocladia, Phacelocarpus 
PM 
o 
M3 
Stictosporaceae 
Stictosporum 
Sarcodiaceae 
— 
P 
o 
W 
Gracilariaceae 
Gracilaria, Melanthalia, etc. 
w 
c r 
Mychodeaceae 
Mychodea 
. pH 
< 
Acrotylaceae 
Acrotylus, Hennedya 
m 
o 
Phyllophoraceae .... 
Stenogramme 
Ul 
<J • 
n 
p 
Gigartinaceae 
Gigartina, Iridophycus 
P 
m 
o 
Rhodymeniales . 
J 
'Rhodymeniaceae . . . 
Rhodymeniai Chrysymenia, etc. 
1 
^Champiaceae 
Chamjpia, Chylocladia 
f Ceramiaceae 
Callithamnion, Ceramium, etc. 
Ceramiales 
\ 
Delesseriaceae 
Delesseria , Nitophyllum, etc. 
Dasyaceae 
Dasya, Thuretia , etc. 
Rhodomelaceae .... 
Polysiphonia, Laurencia, etc. 
Class RHODOPHYCEAE Oltmanns 1904. 
Plants unicellular, filamentous or parenchymatous; cells usually uninu- 
cleate, with from one to many rose-red chromatophores ; cell division 
mitotic ; growth apical or intercalary ; life cycle in the higher forms show- 
ing a regular alternation of generations, the gametophytes producing 
gametes (eggs and sperms) and the sporophyte producing spores. 
The broad classification is set out in the accompanying table. 
Subclass PROTOFLOR1DEAE Rosenvinge 1 909. 
Morphological alternation of generations not present, the plants being 
either entirely asexual or consisting of monoecious or dioecious gameto- 
phytes, the zygote representing the sporophyte; protoplasmic continuity 
between the cells not evident. No true trichogyne. 
Order BANGIALES Schmitz and Hauptfleisch 1896. 
Plants may be unicellular, may form flat membranes of one or two cell 
layers, or they may be erect, forming unbranched or branched filaments ; 
cells uninucleate, spherical, oval, or somewhat angular from pressure, usually 
similar in form throughout the plant body, with intercalary growth; 
chromatophores single, axial, stellate, with a large central pyrenoid, usually 
containing more or less phycocyanin in addition to the other pigments ; 
nuclei somewhat simple in structure ; reproduction in unicellular forms by 
simple fusion.; in multicellular forms by means of motionless, haploid, 
