Cell wall protein involved in development of asexual structures such as phialide and conidium development, and thus required for spore formation (By similarity). Plays a role as a general stress protectant produced by the fungus in competition with antagonistic bacteria (PubMed:24229396). Expression is highly induced by the V-ATPase inhibitor bafilomycin B1 (PubMed:22222772). Expression is also increased by the anti-fungal factor phenyllactic acid (PLA) (PubMed:24229396). Belongs to the phiA family.