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EXPLANATION OF THE PLATES. 
The under-water portions of the reed and of Plav. 
PLATE 11. 
The rhizome portion of the shoots of “giant” reed, Phragmites communis, Vrin. 
В. flavescens, Gren. < Godr. Rosulet. The etiolated portion of the rhizome lives in the mud ; 
it has mud-roots—in this example slightly branched, and therefore somewhat intermediate 
in character between true mud- and water-roots. The green portion of the rhizome lives in 
the water and has water-roots, viz, roots branched to the 3rd degree, on which soil has 
already collected. Some of the internodes of the rhizomes measure about 4 cm. (about 
1:5 inches) in diameter. 
