646 
A. Eu-Floridece, 
1. «Thallus of uni-seriate bran- 
ching cell-filaments, growing by 
apical cells. Intercalary divi- 
sions of segment-cells absent». 
Not so in a number of cases as 
Schmitz adraifs. 
2. Color of chromatophores sarae in botb groups. 
3. Special pits in coll-walls. More 
or less similar ones in some 
Phaeophyceae. 
B. Bangiacece. 
1. Thallus flliform or flattened, 
leaf-like. Divisions intercalary. 
Apical celi frequent in Por- 
phyra. 
4. Reproduction in botli groups 
organs. 
5. Neutral spores are tetraspores 
in most; occasionally monospo- 
res, bispores, or polyspores. 
Rarely scattered over generai 
thallus surface. Not known in 
a few. 
6 
3. Continuity of cell-contents by 
fine strands of protòplasni 
throngh cell-walls as in A., 
but special pits absent. 
by neutral spores and by sexual 
5. Neutral spores are raonospores, 
bispores, or tetraspores. 
In Erythrotrichia monospores 
by geramation not uncomparable 
to innovation of tetrasporangia 
in Rhodochorlon Rothii. 
Neutral spores in each, on gerraination give rise directly to new 
plants. 
7. Male organs of sexual reproduction are spermatia with charac- 
ters common to both groups. 
8. Spermatangia, raother-cells of 
spermatia, are terminal super- 
ficial cells. Chains of sperma- 
tangia in a few, intercalary? 
9. Feraale organ is terminal celi 
of a special carpogenous branch 
and is thè carpogonium with 
a hair-like diverticulum thè 
iì'ichogyne. 
8. Spermatangia by repeated seg- 
raentation of a superficial celi. 
In Eryihroirichia snperficial. 
9. Carpogonium superficial, inter- 
calary. Trichogyne, if present, 
not much developed. 
