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E X P L A N A T IO N OF TH E PLATES.
P late 1. FUCOIDEÆ.
Sa r ga s sum . Fig. 1. Portion of the Frond of S. vulgare; natural size.
2. Portion of one of the Pinnæ. 3. An Air-vesicle divided.
4. Section of a portion of a Receptacle. 5. Seeds ; magnified.
H a l id r y s . Fig. 1. The base and the extremity of the Frond of H-
siliquosa. 2. Section of an Air-vessel ; natural size. S. Section
of a Receptacle. 4. Filaments as they arise from the sides of
the Loculi or cavities, with a Seed. 5. Filaments from the Lo-
culi. 6. Seeds; magnified.
P l a t e II. FUCOIDEÆ.
C y s to s e ir a . Fig. 1. Portion of the Frond of C. granulata; natural
size. 2. The extremity of a small branch with two Receptacles,
and an Air-vessel. 3. A transverse slice of a Receptacle. 4. Filaments
arising from the side of one of the Loculi, with a Seed.
5. Seeds ; magnified.
Fucus. Fig. 1. The upper part of the Frond of F. vesiculosus ; natural
size. 2. Section of a Receptacle. 3. One of the Globules of
Seeds and Filaments removed from the Receptacle. 4. The Filaments
and Seeds of which the globules are composed. S. The
Filaments which issue from the pores on the surface of the Frond ;
magnified.
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