The vascular system of the erect trunk was unusual in that it switched its morphological development as the plant grew.

In Allomyces, the thallus (body) is attached by rhizoids, and has an erect trunk on which reproductive organs are formed at the end of branches.

The erect trunk may be 20 m tall and is usually 6-15 cm in diameter, occasionally as much as 20 cm.

The erect trunk is up to about 1 m tall and 10 cm in diameter.

This species has an erect trunk, usually 2-4 m tall.

The erect, slender trunk is about 80 cm tall and approximately 3 cm in diameter.

This plant has an erect trunk up to 3 m tall or more.

This species has an erect trunk up to 3 m tall.

The erect trunk may be 3 m tall or more and about 20 cm in diameter.

The erect trunk is up to 4.5 m tall, occasionally even 6 m, and about 15 cm in diameter.