Anatomy Anatomy of haustoria

anatomy haustoria {of foreign origin} presence

The negative proof is very difficult, but most of the time ectomycorrhizae lack foreign haustoria. If it was possible to prove that haustoria found do not belong to the ectomycorrhiza former, they are regarded as being of foreign origin. This can be done by detection of different staining behaviour of haustoria and/or their subtending hyphae, by tracing hyphae from the haustoria to those which with certainty do not belong to the ectomycorrhiza former, or by the presence of basidiomycetous features within an ascomycetous ectomycorrhiza and vice versa. Some ectomycorrhizae can be associated consistently with hyphae and haustoria of foreign fungi. Frequently it is difficult to find that fungus which forms the haustoria.

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