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Abstract: Anastomosis occurs in fungi, not only within a mycelium but also between hyphae of different mycelia and even between those of different species, Buller (2) and Langeron (8). For the mycelium of the cultivated mushroom Agaricus campestris var. bisporus the anastomoses are especially important in strand formation and in regeneration, Matthew (12) and Garrett (5). However, the fusion between two mycelia does not take place at will, since imcompatibility between different fungi is often encountered, Raper (14), Lewis (9) and Papazian (13), and is a familiar characteristic even between mycelia and strains of the mushroom as shown in our work on strains during the years, Sigel and Sinden (17). The development of the sporophore is accompanied by a differentiation of the partaking hyphae, Hein (7). The tissue of the stipe remains pseudoparenchymatous for the most part, however, and retains its regenerative character, Magnus (11), Atkinson (1) and Reijnders (15). The first aim of the present work has been to study the possibility of transplantation of young mushroom sporophores onto a new mycelium in such a manner that the hyphae of the transplant and recipient mycelium not only anastomose but afterwards allow the normal development of the fruit body to maturity. After such transplantation was found feasible the factors affecting it were investigated to find an easy and reproducible method by which the transplanting of sporophores could be used to study problems of physiology, nutrition and compatibility. Several such studies using the method have been made and the results are presented here.
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