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SUMMARYThe following conclusions may be drawn from the determination of mycorrhizal spectra on beech at eight localities in Czechoslovakia. Altogether thirty-three sub-subtypes of ectotrophic mycorrhiza on beech were described in Czechoslovakia, of which seven are entirely new, namely: De, Df, Ed, Ee, Ek, Ihand Ik (see Dominik, 1959). Maximum frequencies of ectotrophic mycorrhizas were found down to a depth of 15-30 cm. With increasing depth the number of short roots and mycorrhizas decreased and the mycorrhizal spectrum narrowed. The quantities and types of humus were a decisive factor influencing mycorrhiza formation. Subtype E was the most frequent (20.26%) of all mycorrhizas. The richest mycorrhiza spectrum of four comparable localities was at Albrechtice in the Ore Mountains where fourteen sub-subtypes of ectotrophic mycorrhiza were found despite a heavy deposition of industrial ash from power plants and a high concentration of SOj in the atmosphere. No differences were found in the mycorrhiza variety between beech saplings (5-10 years) and older trees (over 100 years), nor was the occurrence of individual mycorrhiza strains characteristic of beech trees of different age.

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