Microkamienskia perpusilla Corazon-Guivin, G. A. Silva & Oehl

Microkamienskia perpusilla (Błaszk. & Kovács) Corazon-Guivin, G. A. Silva & Oehl Fig. 4 C, D Basionym. Glomus perpusillum Błaszk. & Kovács. Synonym. Kamienskia perpusilla (Błaszk. & Kovács) Błaszk., Chwat & Kovács. Specimens examined. Poland. Pomeranian Province, spores from single-species cultures established from spores extracted from a trap pot culture inoculated with rhizosphere soil and root fragments of Ammophila arenaria from the Hel Peninsula maritime dunes (54 ° 47 ' 35 " N, 18 ° 24 ' 69 " E), 7 Aug 2021, P. Niezgoda (slides with spores nos. 3991–3996, LPPDSE). Diagnosis. Differs from Mk. peruviana, the phylogenetic sister (Fig. 1), in (i) morphometric features of the spore wall, the spore subtending hypha, and the pore connecting the subtending hyphal lumen with the spore interior, (ii) phenotypic properties of spore wall layer 1 and subtending hyphal wall layer 1, and (iii) nucleotide composition of sequences of the 45 S nuc rDNA region (Błaszkowski et al. 2009 a; Corazon-Guivin et al. 2019 b; see “ Discussion ” for details). Notes. The morphological features of Isolate 524 (Fig. 4 C, D), here recognized to be conspecific with Mk. perpusilla, were nearly identical to those originally defined for G. perpusillum (Błaszkowski et al. 2009 a). The only discrepancy was the lack of plasticity and contractibility of spore wall layer 2 in Isolate 524, which were considered unique features of G. perpusillum.