Abstract
The mechanism of cuticular penetration by the germ-tubes of uredospores of two rusts is described and compared with the normal mechanism of penetration through stomata. In Puccinia psidii an appressorium forms at the tip of a short germ-tube and from it an infection peg penetrates between epidermal cells to establish an intercellular mycelium with haustoria in the host leaf. In Ravenelia humphreyana appressoria are frequently produced sessile to the uredospore and an infection peg penetrates directly into an epidermal cell of the leaf and enlarges as a vesicular haustorium; adjacent cells become similarly infected without the establishment of an intercellular mycelium. These mechanisms of penetration are discussed in relation to the behaviour of the germ-tube and the process of appressorium formation.
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