⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record tro-35150681, with some changes.

Macromitrium williamsii E.B. Bartram is a synonym of Macromitrium scoparium Mitt.

This name is a synonym of Macromitrium scoparium Mitt..

The record derives from Tropicos which reports it as a synonym (record 35150681) with original publication details: Contr. U.S. Natl. Herb. 26: 84. f. 22 84 1928.