4 literature references for Porotrichum macropoma Herzog, 1916:

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: Herzog
Year: 1916
Title:
Source: Biblioth. Bot.
Author: Brotherus & Watts
Year: 1918
Title:
Source: Proc. Linn. Soc. New South Wales
Author: Herzog, T.
Year: 1916
Title: Die Bryophyten meiner zweiten Reise durch Bolivia
Source: Biblioth. Bot.