In this contribution to the mycoflora of Karaj, notes are given on 28 species of micromycetes (Peronosporales, Erysiphales, Dothideales, Leotiales, Ustilaginales and mitosporic fungi) mainly collected by the authors in various parts of Karaj area. Six species are new records for Iran viz. Ramularia geranii var. geranii on Geranium pyrenaicum, Septoria gallica on Colchicum robustum, Sphaerotheca...