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PI. cell apL 2. THALASSIOPHYT^. sir
Fam. II. 2. THALASSIOPHYT^. Lamouroux.
Algariim pars, Linnaeus and Jussieu.
Thallus coriaceous, membranaceous, or fleshy; continuous
or jointed ; fibrous or cellular ; sporidia enclosed in thecse,
or immersed in the substance of the thallus.— Plants mostly
marine, olive green or red, absorbing water by their surface
in the immersed part, but not transmitting it to other
parts ; emit oxygen gas by the action of light.
A. Thalkis jointed, membranaceojis, tubular ; jointsformed
of a simple tube; sporidia enclosed in theccE. Ceramidese.
Thallus olive-green, gelatinous,
from a common axis Mesogloja. 26.
Thallus green ; secondary branches
simple, bristlelike, swollen at bottom . . BuLBOCHiETE. 27-
Thallus brownish
branches jointed; theccB naked Ectocarpus. 28.
Thallus red; hiois pellucid;
iheccB naked Callithamnign. 29.
Thallus red ; knots coloured
thecce involucrated Ceramium. 30.
Thallus red; knots pellucid;
sporidia involucrated Griffitsia. 31..
Thallus red, gelatinous;
branches mvfh'vcls; thecce noked Borkichius. 32^
Thallus green, gelatinous;
branches in whirls ; thecce naked Batrachospemum. 33.
B. Thallus jointed, coriaceous, or membranaceous ; main
stem solid, or compoundlyjointed ; sporidia enclosed in thecce-.
Hutchinsideffi.
Thallus olive-green
branches in whiris; joints simple.... Cladostephus. 34.
Thallus olive-green
branches 2-rowed; joints compound .. Sphacelaria. 35.
Thallus red
branches scattered; joints simple; Ellisius. 36.
Thallus red
branches scattered ; joints compound . . . Hutchinsia. 37.
Thallus red, pervaded by a
central, jointed axis Vertebrata. 38.