Polyosma rigidiuscula was described jointly by M and Bailey in Bailey (1890b), pp. 4-5, published in October 1890. The entry was followed immediately by notes by Bailey on Tillaea purpurata.
Letter not found; item is a register entry only, dated 12 August 1890.
Please cite as “FVM-90-08-12a,” in Correspondence of Ferdinand von Mueller, edited by R.W. Home, Thomas A. Darragh, A.M. Lucas, Sara Maroske, D.M. Sinkora†, J.H. Voigt† and Monika Wells accessed on 5 June 2025, https://epsilon.ac.uk/view/vonmueller/letters/90-08-12a