 Another "U. botrytis" metabolite is 1-hydroxy-6-methyl-8-(hydroxymethyl)xanthone, which has antimicrobial effects indicating its identification as an antifungal metabolite.Importantly, a major protein allergen of "Alternaria alternata", termed Alt a 1, and an allergen homologous to it is expressed in the excretory-secretory materials of "U. botrytis".The distribution of "Ulocladium botrytis" is fairly broad, wherein it has been found worldwide in areas of Europe, North America, Egypt, India, Pakistan, and Kuwait.