POLISH GLOMALES .10. ACAULOSPORA-DILATATA AND SCUTELLOSPORA-DIPURPURASCENS

Spores of Acaulospora dilatata and Scutellospora dipurpurascens found in Poland are described and illustrated and their occurrence and distr ibution are characterized and mapped. Spores of Acaulospora dilatata f rom Poland do not differ from those originally described in the United States of America. The germination shield found in a number of spores is described and illustrated, and compared with that occurring in mem bers of the genus Scutellospora. Acaulospora dilatata was found in fiv e of the 303 soil samples taken from around the roots of Ammophila are naria colonizing maritime sand dunes of the Slowinski National Park. P olish specimens of S. dipurpurascens are similar in size, wall structu re, and reaction in Melzer's reagent to those described from the type localized in the United States of America. However, some spores from P oland have a thicker wall, greater sporogenous cells, and are somewhat darker coloured. They were recovered from 34 soils sampled from fores ts, gardens, sand dunes, and both cultivated and uncultivated soils. S . dipurpurascens was commonly associated with different plants of the Hel Peninsula and occurred regularly among the roots of Ammophila aren aria growing in the Slowinski National Park. Both species were found f or the first time in Poland and are probably new to Europe.