This name is a synonym of Alsophila firma (Baker) D.S. Conant.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26621109) with original publication details: Mém. Foug. 8: 111 1857.
This name was in version 1 of The Plant List, record tro-26621109.