15 preparate microscopice care prezinta ferigi primare (Psilophytinae): 1(d). Psilotum, rizom, 2(d). Psilotum, tulpina, 3(c). Clubmoss, 4(e). Clubmoss, 5(c). Selaginella ( Coada calului, tulpina, 6(c) (Coada calului), 8(b, Aspidium, 13(d). . d).
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