Lycopodium alkaloids1 such as serratinine (4) and lycodoline (5), possessing a common formula of C16N, and lucidines A and B, with that of C30N3, are a class of natural products with unique ring systems, which have attracted great interest from biogenetic,1,2 synthetic,1,3 and biological4 points of view. These unique skeletons have prompted us extensive phytochemical work. In our search for biogenetic intermediates of Lycopodium alkaloids, three new alkaloids, serratezomines A (1), B (2), and C (3), with a seco-serratinine-type, a serratinine-type, and a lycodoline-type skeletons, respectively, were isolated from the club moss Lycopodium serratum var. serratum. In this paper, we describe the isolation and structure elucidation of 1-3.