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318 2. THALASSIOPHYTiE. Plcell.aph.<br />

C. Thallus with a continued Jihrmis axis; bark chalklike,<br />

jointed. Corallideae.<br />

Thallus forked ; joints cylindrical Jania. 39.<br />

Thallus three-forked ; jof/z/5 wedgelike Corallina. 40.<br />

D. Thallus contiimtus green or reddish ; Jibres parallel,<br />

diverging from the base; hark chalklike or hairy. Zonarideae.<br />

Thallus ribless, fanshaped Zonaria. 41.<br />

Thallus ribless, forked . . . . < Dictyota. 42.<br />

Thallus ribbed, forked Dictyopteris. 43.<br />

E. Thallus co7ifinuo7is, cellular, green becoming tvhite<br />

inrk smooth ; sporidia scattered, immersed. Ulvoideae.<br />

Thallus compressed ; sporidia prominent<br />

ASPEROCOCCUS. 44.<br />

TA

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