Methanol extracts of G. fornicatum were shown to be inhibitory to the growth of various bacteria that are pathogenic to humans, including Bacillus subtilis, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Salmonella typhimurium, and Streptococcus pyogenes, as well as the fungi Candida albicans, Rhodotorula rubra, and Kluyveromyces fragilis.