31.   He was watching the dark current run past, eddying among the tree roots at the bank.

32.   I take a turn up another nature trail webbed with fir tree roots.

33.   I pushed away branches, tripped over a few tree roots, eased down a steep bank and set my sneakers firmly in the mud.

34.   In a brief article in Nature, they report that the fungi, which are found among tree roots, show almost no genetic variation across the species.

35.   In soil where tree and grass roots intermingle, tree roots usually win.

36.   It tells the cicadas to withdraw their beaks from the tree roots and start crawling upward.

37.   Mr. Gaskins was fascinated by the cypress tree roots that rose, gnarled into grotesque shapes, above the water.

38.   Mulch the area around tree roots with bark chips to help hold in moisture and cut down on competition from lawn.

39.   Of course trees feel the tug of tree roots ripping away and vibrate when the earth quakes under the impact of a falling tree.

40.   Once in a while somebody tries to escape before her own limbs petrify like underwater tree roots.