Six carabidicolous species of Laboulbeniales are reported as new for the Japanese mycoflora. They are Dixomyces stomonaxi, Laboulbenia picardii, L. tenera, L. slackensis, L. aristata and L. kwangjuensis. Two forms of D. stomonaxi are distinguished, one form of which resembles D. nigromarginatus. A remarkable ornamentation consisting of a coillike pattern occurs on the receptacle of L. picardii. In L. tenera and L. slackensis, the outer appendage has somewhat constricted, blackened septa near the base. Laboulbenia aristata and L. kwangjuensis have spirally arranged outer wall cells. Antheridia were observed in L. tenera, L. slackensis, L. aristata and L. kwangjuensis.