20 Microscope Slides.
1(c). Pine (Pinus), healthy leaves, t.s.
2(c). Pine (Pinus) leaves damaged by acid rain, t.s.
3(c). Fir (Abies), healthy leaves, t.s.
4(c). Fir (Abies), stem tip damaged t.s.
5(c). Beech (Fagus), healthy leaves t.s.
6(c). Beech (Fagus), t.s. of leaves with destroyed epidermis and chloroplasts
7(d). Rhytisma acerinum, tar spot of maples, consequence of single-crop farming
8(d). Early leaf fall, caused by thawing salt
9(d). Healthy lichen, indicator of clean air
10(d). Damaged lichen, caused by air pollution
11(c). Healthy wood of beech, t.s.
12(d). Wood destroyed by fungus
13(d). Polyporus, wood rot fungus, fruiting body t.s.
14(d). Root nodules of Alnus, with symbiotic bacteria
15(d). Spruce beetle (Cryphalus picea), larva t.s.
16(c). Wood with normal annual rings, t.s.
17(c). Wood with anomalous narrow annual rings caused by drought, t.s.
18(d). Bark with larval galleries of spruce beetle, t.s.
19(d). Pineapple-like gall on spruce caused by lice, t.s.
20(d). Gall nut on oak caused by insects, t.s.