An Ultrastructural Comparison of the Aecial and Telial Haustoria of the Autoecious Rust Puccinia podophylli

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Abstract
The aecial and telial haustoria of the autoecious rust P. podophylli produced in spongy-mesophyll leaf cells of Podophyllum peltatum are morphologically different from one another. The major differences are as follows: the diameter of the aecial haustorium at the site of host wall penetration is greater than that of the telial haustorium; the aecial haustorium is hyphal in appearance while the telial haustorium possesses a slender neck region with a darkly staining neck band and a lobed haustorial body; the aecial haustorium characteristically possesses a septum near its proximal end while such a septum is absent from the telial haustorium and a collar of host-cell wall material surrounds the proximal end of the aecial haustorium but is absent from the telial haustorium.

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