644 
IX. ALGjE. 
Subtribe Gigartinea. Spore-masses compound. 
§ 1. Tylocarpese. Frond rigid, compact ; inner stratum of roundish polygonal cells 
outer of densely packed vertical filaments. 
Frond flat, leaf-like. Conceptacles linear, rib-like 74. Stenogramma. 
Frond linear, subterete, subcartilaginous 75. Gyhnogongrus. 
§ 2. Kallymenieee. Frond membranous or coriaceous ; inner stratum of longitudinal 
filaments or of polygonal cells surrounded by these ; outer of roundish or polygonal 
cells, smaller outwards ; the cortical of minute vertical filaments. 
Frond flat, dichotomous ; inner stratum of large roundish cells in a 
network of filaments 76. Callophyllis. 
Frond flat, subsessile, expanded ; inner stratum of longitudinal inter- 
laced fibres 77- Kallymenia. 
§ 3. Eugigartinese. Frond cartilaginous , wholly composed of slender anastomosing 
longitudinal filaments set in firm gelatine. Tetraspores in sori. 
* Spore-mass surrounded by a coat of densely interwoven filaments. 
Frond terete or flat. Spore-mass in an external conceptacle . . 78- Gigartina. 
Frond flat, simple or vaguely cleft. Spore-mass imbedded in the 
frond 79. Irida:a. 
** Spore-mass immersed in the frond, with no definite coat. 
Frond flabelliform, dichotomous 80. Chondrus. 
Subtribe Cryptonemea:. Spore-masses, simple, rounded. 
§ 4. Gastrocarpese. Inner stratum of anastomosing filaments or polygonal cells ; outer 
of rows of smaller cells, the outermost smallest and coalescing . 
a. Conceptacles external, with a defined pericarp. 
Frond flat, forked, ribbed below ; inner stratum cellular. Concep- 
tacles on proper leaflets, springing from the lamina .... 81. Epymenia. 
Frond linear, tubular, constricted at intervals, thus divided into 
water-sacs, traversed by longitudinal filaments 82. Chylocladia. 
Frond compressed, tubular, not constricted, full of water and tra- 
versed by longitudinal filaments 83. Chrysimenia. 
/8. Spore-mass immersed in the frond. 
Frond flat or compressed, dichotomous, pinuatifid 84. Halymenia. 
§ 5. Eemastomese. Frond composed of two strata of filaments (with rarely an interme- 
diate cellular one); inner stratum longitudinal, interlaced; outer vertical, dichoto- 
mously fastigiate. Spore-masses in the N. Z. genera dispersed through the frond 
(not in separate branches). 
a. Frond compact, solid, compressed or flat ( tubular and soft in some Nemastomse). 
F'rond with a stratum of ronudish cells between the inner and outer 
filamentous ones 85. Prionitis. 
Frond of two filamentous strata. 
Frond flat, pinnated. Favellidia with a pore 86. Gratkloupia. 
Frond compressed, dichotomous or pinnate. Favellidia im- 
mersed 87. Nemastoma. 
0. Frond cylindric, tubular, continuous or constricted at intervals. 
Spore-masses in ovoid or subglobose branchlets 88. Cateneli.a. 
Spore-masses scattered, in the inner surface of the frond .... 89. Dumontia. 
