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Mixed plankton, strewn slide No. III
Pine (Pinus), healthy leaves, t.s.
Pine (Pinus) leaves damaged by acid rain, t.s.
Fir (Abies), healthy leaves, t.s.
Fir (Abies), stem tip damaged t.s.
Beech (Fagus), healthy leaves t.s.
Beech (Fagus), t.s. of leaves with destroyed epidermis and chloroplasts
Rhytisma acerinum, tar spot of maples, consequence of single-crop farming
Early leaf fall, caused by thawing salt
Healthy lichen, indicator of clean air
Damaged lichen, caused by air pollution
Healthy wood of beech, t.s.
Wood destroyed by fungus
Polyporus, wood rot fungus, fruiting body t.s.
Root nodules of Alnus, with symbiotic bacteria
Spruce beetle (Cryphalus picea), larva t.s.
Wood with normal annual rings, t.s.
Wood with anomalous narrow annual rings caused by drought, t.s.
Bark with larval galleries of spruce beetle, t.s.
Pineapple-like gall on spruce caused by lice, t.s.
Gall nut on oak caused by insects, t.s.
Intestinal bacteria (Escherichia coli) from putrid water
Putrefactive bacteria (Spirillum) from sludge poor in oxygen
Putrefactive bacteria (Sphaerotilus) bacteria, forming long chains with sheaths