3 literature references for Hydrocryphaea wardii Dixon, 1931:

Author: Crosby, M. R. and others - REVISED
Year: 1999
Title: REVISED: accepted in a monograph, revision, or descriptive flora since 1963
Source: Checklist Mosses
Author: C. Müller
Year: 1896
Title:
Source: Nuovo Giorn. Bot. Ital., n.s.,
Author: Dixon
Year: 1931
Title:
Source: J. Bot.