Wastewater of textile industry is considered as toxic waste containing various dyes and chemicals that makes it recalcitrants. Decolorization of wastewater of the industry was conducted in our laboratorium using fungi isolated from a local forest of North Sumatera. Six potential isolates, previously screened for the ability to grow in plate media containing 100% of wastewater, were used for the study in a liquid culture condition. The results show that all tested isolates grew. The growth response of isolates cultured in a media supplemeted with 1% glucose was about two to three times higher than that of cultures without glucose. In the first culture, the fungi grew on the surface of the media however in the latter experiment, it concentrated on the bottom of culture flask for all of tested isolates. Decolorization analysis shows that all isolates were able to decolorize the wastewater. The cultures supplemented with glucose decolorized wastewater from 20% to 46%, while cultures without glucose did much higher about 56% to 92%. Furthermore, a microscopic analysis shows that dyes molecules in the wastewater were absorbed to fungal mycelia. The findings show that extraceluler molecules existed on the surface of fungal mycelia play an important role in the absorption of dye molecules.