Rust (fungus) only uredinia and telia. Spermagonia may be absent from each type but especially the microcyclic life cycle. In macrocyclic and demicyclic life cycles, the rust may be either host alternating (heteroecious), i.e., the aecial state is on one kind of plant but the telial state on a different and unrelated plant, or non-host alternating (autoecious), i.e., the aecial and telial states on the same kind of plant. Heteroecious rust fungi require two unrelated hosts to complete their life cycle, with the primary host being infected by aeciospores and the alternate host being infected with basidiospores. This can be contrasted with
What Kind of Fool What Kind of Fool "What Kind of Fool" is the title of a vocal duet from 1981 (see 1981 in music) by singers Barbra Streisand and Barry Gibb. The song was written by Gibb and Albhy Galuten. The songs on the "Guilty" album were a collaboration between Streisand and all the members of the Bee Gees, including Barry's brothers, Robin and Maurice Gibb. But Barry Gibb played the largest role of the brothers on the album, co-writing and co-producing all of the tracks, appearing on the album cover embracing Streisand, and singing two duets with her. Co-producer Karl Richardson was