20 slides

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