Abstract
The ability of the ericoid mycorrhizal endophyte Hymenoscyphus ericae and of mycorrhizal and non-mycorrhizal ericaceous plants to utilize mineral and simple organic nitrogen is analysed. Growth of the endophyte occurs readily on acidic, basic and neutral amino-acids and on the amino-sugar glucosamine, final yields on most of these sources being comparable with those obtained on ammonium. Mycorrhizal plants produce greater yields than non-mycorrhizal ones and have higher nitrogen contents on several of the amino-acids tested. The significance of these results is discussed in relation both to the physiology of the endophyte and to the availability of N sources in soils.
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