Science

Photographs of members of this family of heteroecious rusts which have two alternating hosts, typically a pine and a flowering plant.

Information from Wikipedia on the Uredinales, plant parasites which mainly cause foliar infections.

An illustrated article by Tom Volk on this rust fungus which is parasitic on the eastern red cedar and the apple tree, alternating between these two hosts.

Several enlarged photographs of these minute fungi.

Photographs of this species, some enlarged, growing on the underside of leaves and magnified images of the uredospores.

Several photographs of this species which infects antirrhinums, and microscopic images of the uredospores.

Many photographs, some enlarged or magnified, of this rust fungus.

Photographs of this rust fungus which infects ferns, and magnified images of the uredospores.