3 literature references for Anoectangium flexuosum Negri, 1908:

Author: Crosby, M. R. and others - INSUFFICIENT
Year: 1999
Title: INSUFFICIENTLY known because not REVISED since its pre-1963 publication; that is to say we have no more information about the species than Index Muscorum; merely relisted without additional specimens in a checklist since 1963; may have been treated in
Source: Checklist Mosses
Author: Negri
Year: 1908
Title:
Source: Ann. Bot. (Rome)
Author: A. J. E. Smith
Year: 1992
Title:
Source: J. Bryol.