cluster cup

noun

1. aecium.

Word History and Origins

Origin of cluster cup¹

First recorded in 1880–85

Example Sentences

The first form met with in most rusts is sometimes called the “cluster-cup” stage, and in many species is the only stage known.

From Project Gutenberg

They are thick-walled, and the contents resemble those of the cluster-cup spores described above.

From Project Gutenberg