LXXV. N a c c a e i a . Frond filiform, solid, coUular; the ramuli (only) composed
of radiating, free filaments.
LXXVI. G lo io s ip h o n ia . Frond tubular; the walls composed of radiating filaments.
LXXVII. N em a le o n . Frond filiform, solid, elastic; the axis composed of
closely packed, vertical filaments; the periphery of moniliform, free, horizontal
filaments.
LXXVIII. D u d r e s n a i a . Frond filiform, solid, gelatinous; the axis composed
of a net-work of anastomosing vertical filaments; the periphery of mouili-
form, free, horizontal filaments.
LXVlX. C e o u a n ia . Frond filiform, consisting of a jointed filament {axis),
whorled at the joints with minute, multifid, moniliform, free, horizontal filaments
(or ramelli).
Order 13. C e e am ia o eæ . Rose-red or¡
consisting of an a^-ticulated, hranching filament, composed o f a single
string o f ajlindrical cells, sometimes coated with, a stratum o f smaller
polygonal cells. Fructification ¿otóíe : 1. Fa-ie\\æ,berry-ü]ce receptacles,
with a membranous coat, containing numerous angular spores. 3. Tetraspores,
attached to the ramuli, or subimmersed in their substance,
scattered.
LXXX. P t i l o t a . Frond compressed, inarticulate, distichous, pectinato-pinnate.
Favellæ stalked, involúcrate.
LXXXI. M ic b o o l a d ia . Frond filiform, inarticulate, dichotomous. Fmellee
sessile, involúcrate.
LXXXII. C eram ium . Frond filiform, articulate, dichotomous ; the nodes opake.
Favellce sessüe, mostly involúcrate. Tetraspores immersed or subimmersed.
LXXXIII. S p y e id ia . Frond filiform, inarticulate ; the branches clothed with
minute, setiform, articulated ramelli. Favelloe stalked, involúcrate. Tetraspores
sessile on the ramelli.
LXXXIV. G e i f f i t h s i a . Frond articulated, dichotomous, or clothed with
whorled, dichotomous ramelli. Faveïtoe involucrated, sessile, or stalked.
Tetraspores sessile, on whorled ramelli.
LXXXV. W e a n g e l i a . Frond articulated, pinnate. Faveïlæ terminal, involucrated,
containing tufts of peai’-shaped spores. Tetraspores sessile, scattered.
LXXXVI. S e ie o sp o e a . Frond articulated. Tetraspores disposed in terminal,
moniliform strings.
LXXXVII. C a d l ith am n io n . Frond (at least the branches and ramuli) articulate,
mostly pinnate. Favelloe terminal or lateral, sessile, without involucre
(except in 0. Turneri) Tetraspores sessile or pedicellate, scattered.
S u b - c la s s I I I . CHLOEOSPESMEÆ OE CONFEEVALES.
(Grass-green* Seaweeds.)
Order 14. S ip h o n a c b æ . Green, maritie, or fresh-water Algoe, composed of
continuous, tubular, simple, or branched filaments (elongated cylindrical
cells), free, or variously combined in cylindrical or expanded fronds.
LXXXVIII. CoDiuM. Filaments combined into a spongy frond.
LXXXIX. B e y o p s is . Filaments free, pinnated.
* A few Vhacece and Oscilîatoriacece ai’c pui'plc.
XC. V a u o h e e ia . Filaments free, dichotomous or irregular.
Order 15. C o n f e e v a c e ^ . Green, marine, or fresh-water Algm, composed of
articulated filaments, àmpie or branched, free or invested by gelatine.
Cells cylindrical, truncate.
Sub-order 1. C o n f e r v e * . Filaments free, destitute o f gelatine.
XCI. C la d o p h o e a . Filaments tufted, branched.
XCII. E h iz o o lo n ium . Filaments decumbent, subsimple, emitting a few rootlike
branches.
XCIII. C o n f e r v a . Filaments unbranched.
Sub-order 3. C h æ to p h o e eæ . Filaments united in, submemiranaceous or
gelatinous fronds ; cells often tipped with bristles. Sporangia external.
XCIV. OcHLOCHÆTE. Frond disciform. Filaments radiating from a central
point, prostrate, irregularly branched ; each cell produced above into a
rigid, inarticulate bristle.
Order 16. U lv a c e * . Green, or rarely purple, marine or fresh-water Algoe,
composed o f small polygonal cells, forming expanded memiranes, or membranous
tubes; very rarely arranged in filaments.
XCV. E n te e om o e p h a . Frond tubular.
XCVI. U ly a . Frond fiat, green.
XCVII. P o e p h y e a . Frond purple.
XCVIII. B a n g ia . Frond filiform (mostly), pui-ple or pink.
Order 17. O s o i l l a t o e i a c e * . Green or blue, rarely purple, marine or
(more freguently) fresh-water Algoe, composed of continuous, tubular,
simple, or rarely branching filaments, which are either free or invested
with gelatine. Endochrome annulated, at length separating into lenticular
sporidia.
Sub-order 1. E i v u l a e i e * . Filaments united together into a solid gelatinous
or cartilaginous frond.
XCIX. E i v u l a e i a . Filaments not sheathed.
C. ScHizosiPHON. Filaments sheathed ; th e sheath multifid.
Sub-order 3. O s c i l l a to e i e æ . Filaments tufted or stratified, free.
Cl. ScHizoTHBlx. Filaments rigid, in branching bundles, a t length splitting.
CII. C a l o th e ix . Filaments short, tufted, fixed a t the base only.
CHI. L y n g b y a . Filaments elongate, decumbent, flaccid.
CIV. M ic e o c o le u s . Filaments needle-shaped, several enclosed together in
membranous or gelatinous sheaths.
CV. OsciLLATOKiA. Filaments needle-shaped, straight, or slightly curved, short,
heaped together in gelatinous strata, oscillating.
CVI. S p i e u lin a . Filaments spirally twisted, lying in a mucous stratum, vividly
oseillatmg.
Order 18. N o s to o h a c e * . Green, fresh-water or rarely marine Algce, composed
of moniliform filaments, lying in a gelatinous matrix. Cells globose
or oval.
CVII. Monoemia. a single filament enclosed in a convoluted gelatinous and
branching frond.