Contributes to surface hydrophobicity, which is important for processes such as association of hyphae in reproductive structures, dispersal of aerial spores and adhesion of pathogens to host structures. Important for the formation of hydrophobic rodlet layers of asexually-produced spores. Accumulates at about the time sterigmata appear and remains at high levels throughout the final stages of conidiophore formation and during spore differentiation and maturation. By brlA. Belongs to the fungal hydrophobin family.