STRUCTURE AND HISTORY ОЕ PLAV. 287 
PLATE 12. 
A young giant-reed stool. Delta of the Danube. The tussock-portion measures about 
0-4 m. (about 1 foot 4 inches). The photograph is taken against a door which measures 
about 1:65 m. (about 5 feet 3 inches). Some of the mud-roots are about 0'3 m. (about 
12 inches) in length. 
PLATE 13. 
A medium-sized stool of giant-reed. Delta of the Danube. About 0-95 m. (about 
З feet 2 inches), are shown in the photo. Tussock-portion about 0:3 m. (about 12 inches). 
PLATE 14. 
Two pieces of the Sherneshenko Sahi Play turned upside down, near Lake ltosulet. 
In the piece in the background the rhizomes are green as the light reaches the edge of Plav ; 
algæ, Vorticella, Dreissena, etc. also coat them. The piece in the foreground is cut from 
the inside of the Plav, hence the etiolated rhizomes. The rhizomes curve round to the 
surface, that is to say, the Plav increases in size slightly by the growth of its edge. 
Many water-roots and much soil is shown in the photo. 
PLATE 15. 
Section through giant-reed Plav, Nazaraou Rinok, Lake Rosulet. ‘The length of the 
aerial portions of the shoot is about 515 m. (slightly over 17 feet), See Pl. 24, section I. 
The door measures about 1°65 m. (about 5 feet 5 inches), and the Plav about 1:7 m. (about 
5 feet 7 inches) in thickness. That Plav is built up chiefly of vertical rhizomes shows clearly in 
this photo, as also the heulthiness of the base of the Plav-layer, The top layer of black soil just 
shows at the upper edge in the photo: in this soil Polystichum Thelypteris, Roth, is rooted. 
PLATE 16. 
Section through slender (‘shitka”) reed Plav near Rogulet. The thickness of this 
Plav is about 15 m. (about 5 feet), and the length of the aerial portion of the reed is 
about 2 m. (about 6 feet 62 inches). 
PLATE 17. 
An edge piece of the Sherneshenko Sahi Plav. The irregularity of disposition of the 
rhizomes is probably due to this piece having grown when the reed was floating, that is to 
say, when it was Play. 
The aerial portions of the reed and of Plav. 
PLATE 18. 
Fig. l.—Edge of a Plav of giant-reed, near Lake Rosu. The length of the aerial 
portion of the reed-shoots (the minor individuals) is about 4:5 m. (about 15 feet). There 
is much Carex paniculata, Linn., at the edge of this Play. 
Fig. 2.—The Ivan Mekitenko Plav. Its oldest portion is in the foreground and its 
younger portion formed of short giant-reed in the background. These two portions are 
sharply separated from each other, as shown in the photo. 
PLATE 19. 
Fig. 1.—The surface of a giant-reed Plav. The shoots measure between 45-5 m. 
(15 to 16 feet) in height. Near Rogulet. The boy's height is about 1-4 m. (about 4 ft. 8in.). 
Fig, 2.—The surface of а Plav of short-slender reed. Near ltosulet. The shoots are 
aged minor individuals and measure about 2 m. (6 feet 63 inches) in height. The under- 
growth is mixed, but Polystichum Thelypteris, Roth, is much the most abundant species. 
