* Frond filiform, articulated.
XLVI. CoiiALLiNA. Frond pinnated. Ceramidia terminal, simple.
XLVII. J a n i a . Î ’roMi7(in the Brit, species) dichotomous. tipped with
two hoi'ii-like ramuli.
* * Frond crustaceous or foliaceom, not articulated.
XLVIII. M e lo b e s ia . Opake, stony ; crustaceous, foliaceous, or shrubby,
XLIX. ? IIiLDENBKANDTiA. Cartilaginous (not stony), incrusting rocks.
L.? H a p am d ium {Katz.). Minute, crustaceo-membranaceous, hyaline, composed
of a single stratum of cells radiating from a centre.
Order 10. D e l e s s e e i a c e æ . Ilo.sy or purple-red or blood-red seaweeds,
with a leafy, rarely filiform, areolated, inarticulate frond, composed of
polygonal cells. Leaves delicately membranaceous. Fructification
double : 1. Conceptacles (coccidia) external or half-immersed, hemispherical,
usually imperforate, containing, beneath a membranous pericarp,
a tuft o f filaments, whose cells are finally changed into spores. 3. Tetraspores
in distinctly dfined sori, either scattered or confined to proper
leaflets (sporophylla).
LI. D e le s s b e ia . Frond leafy, of definite form, with a perourrent midrib.
LII. N i to p h y llum . Frond leafy, irregularly lobed, without midrib.
L III. P lo o am ium . Frond linear, compressed, distiohously much branched; ra muli
pectinate, acute.
Order 11. UnoDYMENiACEÆ. Furplish or blood-red seaweeds, with an expanded
or filiform, inarticulate frond, composed o f polygonal cells ; occasionally
traversed by a fibroso-cellular axis. Superficial cells minute,
irregularly packed, or {rarely) disposed in excentric filaments. Fmoti
iicatioii double : 1. Conceptacles (coccidia) external or half-immersed
globose or hemispherical, imperforate, containing, beneath a thick pericarp
a mass of spores, on a central placenta. 3. Tetraspores
persed indefinitely, or forming cloud-like patches.
* Frond flat, leaf-like, dichotomous, or palmate.
LIV. ? S te n o g e am m e . Conceptacles linear, rib-like. {So7-i definite.)
LV. E h o d ym e n ia . Conceptacles hemispherical, scattered.
* * Frond compressed or terete, shrubby, much branched.
LVI. S p hæ e o c o o c u s . Frond linear, two-edged, distichous, traversed by an
obscure midrib.
LVII. G r a c i i a e i a . Frond filiform (rarely compressed or fiat), irregularly
branched ; the central cells very large.
LVIII. H y p n e a . Frond filiform, irregularly branched, traversed by a fibro-
ceUular axis.
O r d e r 13. C e y p to n em ia o eæ . Furplish or rose-red seaweeds, with a filiform
or (rarely) expanded, gelatinous or cartilaginous frond, composed,
wholly or in part, o f cylindrical cells, connected together into threads or
filaments. Axis formed of vertical, periphery o f horizontally excentric
filaments. Fructification double-. 1. Conceptacles (favellidia), globose
masses of spores immersed in the frond, or in swellings of the branches.
3. Tetraspores variously dispersed.
Sub-order 1. C o c c o o a e p eæ . Frond solid, dense, cartilaginous, o
Favellidia in semi-external tubercles or swellings o f the frond.
LIX. G b a te lo u p ia . Pinnated, fiat, membranaceo-cartilaginous, of very dense
structure. Favellidia with a pore. Tetraspores scattered.
LX. G e lid ium . Pinnated, compressed, horny, of very dense structure. Favel-
Udia in swollen ramuli, imperforate. Tetraspores in sori.
LXI. G ig a e t in a . Frond variously branched, cartilaginous; its flesh composed
of anastomosing filaments, lying apart in firm gelatine. Favellidia in external
tubercles. Tetraspores contained in dense, immersed scrri.
Sub-order 3. S p o n g io o a e p eæ . Frond solid, dense, cartilaginous, or horny.
Favellidia (of several) imperfectly known. Wart-like swellings {or ne-
mahtecia) composed o f filaments, sometimes changed into tetraspores ;
sometimes into spores.
LXII. C h o n d e d s . Frond flabelHform, dichotomously cleft, cartilaginous; of
very dense structure. Tetraspores in definite, immersed sori.
LXIII. P h y l lo p h o e a . Frond stipitate, rigid-membranaceous, proliferous ; of
very dense structure. Tetraspores in superficial sori, or in proper leaflets.
LXrV. P e y s s o n e lia . Frond depressed, expanded, rooting by the under surface,
concentrically zoned. Tetraspores contained in superficial warts.
LX¥. G ym n o g o n g ed s. Frond filiform, dichotomous, horny, of very dense
structure. Tetraspores in superficial warts.
LXVI. PoiYiDES. Boot scutate. Frond cylindrical, dichotomous, cartilaginous.
Faveïlæ contained in external, spongy warts. Tetraspores cruciate, immersed
in the branches.
LXVII. F u e o b l i a r i a . Boot branching. Frond cylindrical, dichotomous, cartilaginous.
Favellm immersed in the pod-like swoUen extremities of the
branches. Tetraspores similarly immersed, transversely zoned. {For correct
analysis, see Tab. CCCLVII. A.)
Sub-order 3. G a s te o o a r p e æ . Frond gelatinoso-membranaceous, or fleshy,
hollow, or of lax texture within. Favellidia immersed in the central substance
of the frond, very numerous.
LXTIII. D u jio n tia . Frond cylindrical, tubular. Favellidia immersed in the
wall of the frond. Tetraspores also immersed, cruciate. {For corrected
analysis, see Tab. CCCLYII. B.)
LXIX. H a lym e n ia . Frond compressed or flat, gelatinoso-membranaceous, the
membranous surfaces connected by a- few slender, anastomosing filaments.
Favellidia attached to the inner face of the wall.
LXX. G in a n n ia . Frond cylindrical, distended, traversed by a fibrous ax is; the
walls membranaceous, connected with the axis by horizontal filaments. Favellidia
attached to the walls.
LXXI. K a le ym e n ia . Frond expanded, leaf-like, carnoso-membranous, solid,
of dense structure. Favellidia pimply, half-immersed in the frond, and
scattered over its surface.
LXXII. I r i d æ a . Frond expanded, leaf-like, thick, carnoso-coriaceous, solid, of
dense structure. Favellidia whoUy immersed.
LXXIII. C a t e n e l l a . Frond tubular, branched, constricted at intervals into
oblong pseudo-articulations ; the tube traversed by a few filaments.
Sub-order 4. G lo io o l a d i e æ . Frond loosely gelatinous; the filaments of
which it is composed lying apart from one another, surrounded by a
copious gelatine. Favellidia immersed.
LXXIV. C e u o k ia . Frond crustaceous, skiii-like.