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• <br />TABLE 71-28 <br />(Continued) <br /> Location <br />Periphyton Taxa D-1 D-2 D-3 S-1 S-2 s-3 DH* PT** Comments Reference <br />Suri rella ap tells X X X X G31 Epipeli c. Occurring in flowing McKee and Wolf (1963) <br /> alkaline fresh water. <br />S ny edra minuscula X X X X G9 Prefers cool water. Widely Prescott (1951) <br /> distributed. <br />Synedra ulna 57 Very pollution tolerant. Common Patrick and Reimer (1966) <br /> and widely distributed. Prescott (1951) <br /> <br />DH - Drill Hole 220. <br />**PT - Pollution tolerance rating according to Palmer' s "A Composite Rating of Algae Tolerating Organic Pollution". Lower ratings mean greater to lera nr <br />C - rating from top 60 genera list; S - rating from top 80 species list; NR - no rank listed. <br />