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

SUMMARY

This study demonstrates that the aecial and telial haustoria of the autoecious rust Puccinia podophylli produced in spongy-mesophyll leaf cells of Podophyllum peltatum are morphologically different from one another. The major differences are as follows: 1) the diam of the aecial hautorium at the site of host wall penetration is greater than that of the telial haus- torium; 2) 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; 3) the aecial haustorium characteristically possesses a septum near its proximal end while such a septum is absent from the telial haustorium; 4) a collar of host-cell-wall material surrounds the proximal end of the aecial haustorium but is absent from the telial haustorium.