Nicholls, W.H. (7 January 1936), Orchid notes: two new varieties. The Victorian Naturalist 52(9): 167 [tax. nov.]

• Type: "Victoria: Clydesdale, Sept.–Oct., 1932, to 1935 (Miss M. Ritter.)"

Blackmore, J.A.P. & Clemesha, S.C. (June 1968), A review of the so-called "rufous group" for the genus Pterostylis. The Orchadian 2(12): 164 & fig. [basionym]

basionym of: Pterostylis rufa subsp. aciculiformis (Nicholls) Blackmore & Clemesha legitimate

Jacobs, S.W.L. & Pickard, J. (1981), Plants of New South Wales: 33 [taxonomic synonym]

taxonomic synonym of: Pterostylis rufa subsp. aciculiformis (Nicholls) Blackmore & Clemesha legitimate

Clements, M.A. in Jones, D.L. (ed.) (August 1989), Catalogue of Australian Orchidaceae. Australian Orchid Research 1: 119 [secondary reference]

• Lectotype: "`Victoria, Clydesdale', Sep. 1935, M. Ritter herb. W.H. Nicholls 691 (lectotype MEL! here designated)."

Clements, M.A. in Jones, D.L. (ed.) (August 1989), Catalogue of Australian Orchidaceae. Australian Orchid Research 1: 118 [basionym]

basionym of: Pterostylis aciculiformis (Nicholls) M.A.Clem. & D.L.Jones legitimate

Jones, D.L. in Walsh, N.G. & Entwisle, T.J. (ed.) (1994), Pterostylis. Flora of Victoria Edn. 1, 2: 830 [nomenclatural synonym]

nomenclatural synonym of: Pterostylis aciculiformis (Nicholls) M.A.Clem. & D.L.Jones legitimate

Szlachetko, D.L. (28 February 2001), Genera et species Orchidalium. 1. Polish Botanical Journal 46(1): 23 [basionym]

basionym of: Oligochaetochilus aciculiformis (Nicholls) Szlach. legitimate

Jones, D.L., Clements, M.A. & Molloy, B.P.J. in Banks, D.P. (ed.) (28 November 2002), A synopsis of the subtribe Pterostylidinae. Australian Orchid Research 4: 131 [nomenclatural synonym]

nomenclatural synonym of: Oligochaetochilus aciculiformis (Nicholls) Szlach. legitimate

Jeanes, J.A. in Ross, J.H. & Walsh, N.G. (June 2003), Orchidaceae. A Census of the Vascular Plants of Victoria Edn. 7: 26 [nomenclatural synonym]

nomenclatural synonym of: Pterostylis aciculiformis (Nicholls) M.A.Clem. & D.L.Jones legitimate

Barker, W.R., Barker, R.M., Jessop, J. & Vonow, H. (ed.) (18 March 2005), Census of South Australian Vascular Plants 5th Edition. Journal of the Adelaide Botanic Gardens Supplement 1: 199 [nomenclatural synonym]

nomenclatural synonym of: Pterostylis aciculiformis (Nicholls) M.A.Clem. & D.L.Jones legitimate

Jones, D.L. (2008), Field Guide to the orchids of the Australian Capital Territory: 277 [secondary reference]

• Etymology: "in the form of needles (sepal tips)"

Council of Heads of Australasian Herbaria (28 February 2018), Australian Plant Census: - [nomenclatural synonym]

nomenclatural synonym of: Pterostylis aciculiformis (Nicholls) M.A.Clem. & D.L.Jones legitimate

Jones, D.L. (January 2021), Native Orchids of Australia Edn. 3: 557 [nomenclatural synonym]

nomenclatural synonym of: Oligochaetochilus aciculiformis (Nicholls) Szlach. legitimate

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