On the histology of Uredo dispersa , Erikss., and the 'mycoplasm’ hypothesis

The paper deals with a detailed study of the histological features of the germination, infection, and growth of the mycelium of the Uredo in the tissue of grasses. Primarily, the figures refer especially to theUredo ofPuccinia dispersa in the tissues ofBromus secalinus , but comparisons are made with the behaviour of this and other Uredineæ—e. g .,Puccinia glumarum andP. gramins —in the tissues of other grasses and cereals. The research, which has been carried on over a year and a half and has involved the preparation and microscopic examination of thousands of sections, is principally based on the application of improved hardening and staining methods to preparations from tube cultures of the grasses concerned, the leaves of which were infected at definite spots.