3 literature references for Macromitrium nanothecium C. Müller ex Cardot in Grandidier, 1915:

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: Bridel
Year:
Title:
Source: Muscol. Recent. Suppl.
Author: C. Müller ex Cardot in Grandidier
Year: 1915
Title:
Source: Hist. Phys. Madagascar, Mousses