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Germination of N. haematococca spores in situ, in response to root cap and border cell exudates. After immersion of root tips into a suspension of spores at 105/mL, spores start to germinate within 1 h (arrows). Inset, Left, At 106 spores/mL, chlamydospore formation occurs. Inset, Right, Fungal hyphae grow around border cells without apparent penetration.
