Polytrichum perpusillum Müll. Hal. in Hedwigia 36: 90. 1897 .

= Pogonatum pensilvanicum (Hedw.) P. Beauv., fide O’SHEA & PRICE (2008: 36).

Type citation. – “Paraguay, Caraguaza, ad ripas rivulorum humidas et umbrosas, Febr. 1884, Balansa 3618 ”.

Type specimens. – Isotypes: Caaguazu, sur les berges humides et ombragées des ruisseaux, février 1882, Balansa 3618 (G [1885], G00048075; Herb. Boiss., G00048068; Herb. DC. [1884], G00048074) .

Type designation. – HYVÖNEN (1989: 18): isotype (H-BR), holotype location not indicated.

Comments. – Number 3618, Pogonatum pallens Besch. in Rev. Bryol. 2: 18. 1885. nom. nud. was later used as a type by MÜLLER (1897: 90) for Polytrichum perpusillum Müll. Hal. See discussion in O’SHEA & PRICE (2008: 36).