Étude ultrastructurale comparée des associations symbiotiques mycorhiziennes Helianthemum salicifolium – Terfezia claveryi et Helianthemum salicifolium – Terfezia leptoderma

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Abstract
The authors have studied the ultrastructural organization of two synthetic mycorrhizas between Helianthemum salicifolium (L.) Mill. (Cistaceae) and Terfezia claveryi Chat. or Terfezia leptoderma Tul. (Ascomycetes, Terfeziaceae). With Terfezia claveryi an endomycorrhiza is formed with many of the hyphae hugging the inside surface of the cell wall. The cytoplasmic volume of the mycorrhizal cells is not significantly increased. With Terfezia leptoderma an ectomycorrhiza without a sheath is formed, but there is a typical Hartig net. These two types of mycorrhiza constitute examples of biotrophism.