Fig. 2.

Arbuscular mycorrhizal fungi (AMF), dark septate endophytes (DSE) and Olpidium sp. in the roots of plant species of alien origin in Central Europe; light micrographs of squashed roots in differential interference contrast. a–g – AMF mycelium in the cortex of Ambrosia artemisiifolia (a), Bidens frondosa (b, c), Helianthus ×laetiflorus (d, g), Helianthus tuberosus (e) and Impatiens parviflora (f) (Arum-type); ar – terminally formed arbuscules, at – arbuscule trunk, ih – hyphae growing intercelullary, ve – vesicle formed between cortical cells; g–i – DSE hyphae (dh) and sclerotium (sc) in the outer cortex of Helianthus ×laetiflorus (g) and Impatiens parviflora (h, i) roots; j – Sporangium of Olpidium sp. (os) in the rhizodermal cell of Echinocystis lobata. Bars: a–d, g, j = 25 μm, e, f, h, i = 20 μm