Verrucaria minuscula H. Harada is investigated taxonomically. This species was recently collected from Chiba-ken, central Japan for the first time since the original collection from Shizuoka-ken, central Japan. It is characterized by having almost exposed, small (ca. 0.1 mm diam.) perithecia, relatively small (12-16x5-8//m) ascospores etc., and by growing in terrestrial habitats. Perithecial walls vary greatly in color, from almost colorless throughout, brownish in the outer and ±inner parts, or distinctly bi-layered with almost black outer layer and colorless inner one. lichens, lichenized Ascomycota, Verrucariaceae, Verrucaria, taxonomy, Japan