B.  Irwin, ?Further observations on Corybas.?, New Zealand Native Orchid Group J., vol. no.44, pp. 11 - 13 (1992) - illus., 1992.

B.  Irwin, ?Notes on seven forms of Corybas rivularis.?, New Zealand Native Orchid Group J., vol. no.47, pp. 7 - 9 (1993) - illus., 1993.