 The genus was circumscribed by American mycologist William Alphonso Murrill in 1904.The generic name, which combines the Ancient Greek word ("pore") with the Latin word "nidulus" ("small nest"), refers to the superficial similarity of the cup-shaped "Poronidulus" fruit bodies with those of the genus "Nidularia".A second species, "Poronidulus bivalvis", found in Bogor, was placed in the genus by Franz Xaver Rudolf von Höhnel in 1914.