Scutellospora hawaiiensis, a species common in coastal sand dunes of Hawaii, is described. The pale orange-brown to red-brown spores have six walls; an outermost unit wall (1.2-2.0 um thick) appressed to a laminated wall (0.8-2.2 um), a coriaceous wall (2.8- 4.8 um), a new type of wall (the "notching wall") (0.5- 1.6 um), whose broken edges consist of a series of rectangular and V-shaped notches, resembling a torn linen cloth, a coriaceous wall (2.0-3.3 um) and a thick amorphous wall (3.0-4.0 um, expanding up to 88 um when crushed in acidic mountants).