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Hartig Net Structure of Ectomycorrhizae Synthesized between Laccaria bicolor (Tricholomataceae) and Two Hosts: Betula alleghaniensis (Betulaceae) and Pinus resinosa (Pinaceae)

H. B. Massicotte, R. L. Peterson and L. H. Melville
American Journal of Botany
Vol. 76, No. 11 (Nov., 1989), pp. 1654-1667
Stable URL: http://www.jstor.org/stable/2444403
Page Count: 14
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Hartig Net Structure of Ectomycorrhizae Synthesized between Laccaria bicolor (Tricholomataceae) and Two Hosts: Betula alleghaniensis (Betulaceae) and Pinus resinosa (Pinaceae)
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Abstract

Hartig net structure and ontogeny were compared in ectomycorrhizae synthesized between the broad host range fungus, Laccaria bicolor and two hosts, Betula alleghaniensis and Pinus resinosa. In B alleghaniensis, the Hartig net was present in the epidermis of the three ectomycorrhizal types formed, fast-growing first-order laterals with proximal colonization, clavate second-order laterals, and nonclavate second-order laterals. Root hair-fungus interactions occurred in this association. In P. resinosa, the Hartig net developed in epidermal and cortical cell layers of monopodial and dichotomously branched first-order laterals. Short monopodial laterals exhibited a mantle only. Fungal hyphae in the Hartig net exhibited a complex labyrinthine mode of growth in ectomycorrhizae of both tree species.

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