Abstract
Three types of septa occur in the uredial thalii of Melampsora lini (Ehrenb.) Lev. The typical perforate septa of filamentous hyphae consist of a cross-wall containing two electron-dense layers separated by an electron-transparent central lamella. The central pore in the cross-wall is partially to completely blocked by an electron-dense plug that has the configuration of a pulley wheel. The plug is often surrounded by a distinct region of cytoplasm devoid of organelles. Partial septa occur in filamentous hyphae and pseudoparenchyma of uredial primordia. They consist of thick invaginations of the entire longitudinal wall profile. These septa have large pores which lack plugs and do not impede movement of organelles. Complete septa consisting of cross-walls without pores are typical of the pseudoparenchymatous uredial primordia.
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