Verrucaria kiyosumiensis is a species saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. Found in semi-freshwater habitats in Chiba Prefecture, central Japan, it was formally described as a new species in 2001 by lichenologist Hiroshi Harada. The lichen has almost spherical, exposed black perithecia measuring 0.15âÂÂ0.25 mm in diameter, and dark purplish brown perithecial walls lacking a distinct involucrellum. The periphyses are 10âÂÂ15 üm long with pointed apices, and its ascospores have dimensions of 12âÂÂ16 by 5âÂÂ7 üm. The lichen has an indistinct thallus.