Anderson, J. — Fertilisation of Orchids. — Journal of Horticulture and Cottage Gardener, April 21, 1863, p. 287.
      Gosse, P.H. — Microscopic Observation on some Seeds of Orchids. — Journal of Horticulture and Cottage Gardener, April 21, 1863, p. 287.
      Gray, Asa. — On Platanthera (Habernaria) flava and Gymnademia tridentata. — American Journal of Science and Arts, vol. xxxvi, Sept. 1863, p. 292.
      Journal of Horticolture and Cottage Gardener, — March 17, 1863, p. 206. On Orchid Cultivation, Cros-breeding, and Hybridising.
      Scudder, J.H. — On Pogonia ophioglossoides. — Proceedings of the Boston Society of Natural History, vol. ix, April 1863.
      Treviranus. — Ueber Dichogamio nach C.C. Sprengel und Ch. Darwin, § 3, Orchideen. — Botanische Zeitung, N° 2, 1863, p. 9.
      — Nachträgliche Bemerkungen über die Befruchtung einiger Orchideen. — Bot. Zeitung, No 32, 1863, p. 241.
      Trimen, R. — On the Fertilisation of Disa grandiflora, Linn. — Journal of Linnean Society Botany, vol. vii, 1863, p. 144.
      West of Scotland Horticultural Magazine. — Fertilisation of Orchids, Sept. 1863, p. 65.
      Crüger. — A few Notes on the Fecundation of Orchids, and their Morphology. — Journal of Linnean Society, Botany, vol. iii, No 31, 1864, p. 127.
      Scott, J. — On the Individual Sterility and Cross-impregnation of certain Species of Oncidium. — Journal of Linnean Society, vol. viii, No 31, 1864, p. 162.
      Moggridge, J. Traherne. — Observations on some Orchids of the South of France. — Journal of Linnean Society, Botany, vol. vii, No 32, 1865, p. 256.