Abstract
Two new strains (No. 507 and No. 508), isolated from the soil collected respectively at Higashinoshiro City (Akita Prefecture) and at Kuchian Station (Hokkaido) in July 1955, were identified to be a new species, Streptomyces spiroverticillatus, basing on morphological and cultural studies. The specific epithet shows the characters forming spirals and whirls on the aerial mycelium.
