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Abstract

Ectendomycorrhizae of the Pakistan Ericales viz., Rhododendron lepidotum Wall, ex D. Don., R. afghanicum Aitch. & Herasl., Gaultheria trichophylla Royle., Cassiop e fastigiata D. Don., Pyrola rotundifolia Michx., and Monotropa hypopitys L., were described. Microscopic examination showed typical endophyte in and on the roots and its absence from aerial or subaerial parts. This was supported by attempted isolation experiments. Morphological and anatomical studies suggest a series of increasing saprophytism and its correlated characters from Ericaceae, through Pyrolaceae to Monotropaceae. Endogone spores, responsible for the formation of vesicular- arbuscular mycorrhiza in the majority of plants, were extracted from heath rhizospheres, except that of Monotropa hypopitys, but

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