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PLATE XVI nh 
; og | Figs. 1-4,—-Halicornaria plumosa. 5 
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- Fig. 1.—Natural size. BY et ke cone 
ae Fig. 2.—Portion of stem with hydrocladia ; magnified. 
ae ‘ Fig. 3.—Portion of hydrocladium, still further magnified ; lateral view. 
one y Fig. 4.—Same ; front view. 
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