Pi.cell.aph. 2. THALASSIOPHYT. 319 
I. Thallus continued, fibrous, membranaceous or leather- 
like, purple or red; sporidia immersed or in thece. Floridex. 
Thallus flat, membranaceous, veined ; 
sporidia immersed and in tubercles .... DELESSERIA. 59. 
Thallus flat, membranaceous, veined ; 
thece podshaped, axillary ........... ODONTHALIA. 60. 
Thallus flat, membranaceous, ribless ; 
thece tubercular ................. SPHHROCOCCUS. 61. 
Thallus linear, compressed or round, 
much branched; thece tubercular ...... GIGARTINA. 62. 
Thallus linear, round or compressed ; 
sporidia immersed and in thece ....... GaAsTRIDIUM. 63. 
K. Thallus continuous, woody, fibrous, coriaceous; olive- 
brown becoming black ; sporidia in thece or immersed. Fu- 
coidea. 
Ka. Sporidia superficial among gelatinous fibres. 
Thallus membranaceous, flat; 
fruit scattered ; holdfasts peltate....... ceo. MASE TARY 64: 
Thallus \eatherlike, flat; 
fruit scattered; holdfasts fibrous ....... Lamrnaria. 65. 
Thallus leatherlike, flat: 
fruit on the stirps; holdfasts fibrous.... PHasGonon. 66. 
Thallus threadlike, tubular, supple ; 
sporidia scattered on the surface .......... CHoRDA. 67. 
_ Thallus threadlike, solid, branched ; 
sporidia scattered on the whole surface... CHorparia. 68. 
Kb. Sporidia in scattered, immersed thece. 
Thallus threadlike, cartilaginous .... SpoRocHNUS. 69. 
Thallus compressed, membranaceous DrsMARESTIA. 70. 
Ke. Sporidia in a terminal theca. 
Thallus shrubby, compressed .......... Lycuina. 71., 
Kd. Sporidia in thecee, immersed on an apothecium. 
Thallus cupshaped ; vesicles 0; 
apothecia compressed, forked........ HIMANTHALIA. 72. 
Thallus round, forked, ribless ; 
vesicles 0; apothecia terminal ............ CERVINA. 73. 
