Singh J, Devi S, Jamil Z
National Botanical Research Institute, Lucknow, India.
Ann Allergy. 1989 Sep;63(3):239-43.
Ninety patients were investigated with intradermal testing of developing stages of Pteris vittata L., whole spores, and their fractions. Allergenic principles were found to be present in both protoplasm and spore wall of the fertile tissue.