麦芽根飼料より分離せる有毒物質産生糸状菌の研究 (第1報)

分布, 分離, 培養及び形態について

抄録

A strain of hyphomycetes that produces a toxic substance was isolated from a fungus that was parasitically growing on the malt feed responsible for mass death of milking cows. The fungus penetrates into malt grains from an injured section, causes morbid change in the starch and aleuron layers, to brown the tissues, and produces a metabolic products that causes marked toxicity in animals. The fungus was found to grow on a medium with a wide variety of carbon source. The morphology of the fungus on the Czapek culture medium is as follows: Vegetative mycelium, 3-5×18μ; aerial mycelium, 2μ diam.; conidiophore, 3.0-4.5×400-500μ; metulae, 3.0-5.2×6.0-10.4μ; sterigmata, 2.3-2.7×6.0-6.7μ; conidia, 2.5×3.2μ. Since the morphology and other properties of this fungus are identical with the description for Penicillium urticae Bainier in the classification by Thom (“A Manual of the Penicillia” (1949)), the fungus is now determined as that strain.