There are approximately 24 species and subspecies in this genus: P. amplus · P. brevirostris · P. brevispina · P. bucheri · P. cingulus · P. constrictus · P. dorfi · P. gemmifera · P. gemmigera · P. glans · P. mcgrewi · P. metarhiza · P. nanus · P. obliqua · P. obovata · P. ovata · P. perlatus · P. perryi · P. sculpta · P. simplex · P. sp1 · P. tegere · P. transversa · P. verrucosa
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