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Seedlings of the myco-heterotrophic orchid Corallorhiza trifida which had been germinated in the field in mesh bags developed hyphal links and mycorrhizas with Betula pendula and Salix repens, but not with Pinus sylvestris, when transplanted into soil microcosms. The fungus connecting the myco-heterotroph to Betula and Salix formed endomycorrhiza in the orchid with typical pelotons, but formed ectomycorrhizas with the autotrophs. The orchid plants, when linked to Betula and Salix by fungal hyphae, gained 6-14% in weight over 25-28 wk. In microcosms supporting P. sylvestris, and in control microcosms which lacked autotrophs, the Corallorhiza plants lost 13% of their weight over the same period. In the course of the 28-wk experimental period new Corallorhiza seedlings, in addition to those added as part of the experiment, appeared in the microcosms containing Salix and Betula but not in the Pinus microcosms. Shoots of Betula and Salix plants grown in association with Corallorhiza were fed with |
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