Genetically modified filamentous fungi and uses thereof

A filamentous fungus comprising a genetic modification in at least one hydrophobin gene,

• wherein said at least one hydrophobin gene encodes a polypeptide comprising an amino acid sequence selected from the group consisting of:
• the amino acid sequence having the sequence set forth in SEQ ID #1, an amino acid sequence having at least 85% sequence identity to SEQ ID #1, the amino acid sequence having the sequence set forth in SEQ ID #7, an amino acid sequence having at least 85% sequence identity to SEQ ID #7, the amino acid sequence set forth in SEQ ID #4 and an amino acid sequence having at least 85% sequence identity to SEQ ID #4,
• wherein said genetic modification reduces or abolishes the activity or expression of said hydrophobin,
• wherein said fungus is an Aspergillus spp and with the proviso that not all hydrophobin genes of said fungus are genetically modified,
• wherein said fungus further comprises at least one transgene, and
• wherein said transgene is encoded by an expression vector adapted for expression of said transgene.