1. Cheeseman, T. F. 1906. Manual of the New Zealand Flora. Wellington; pp. 640 to 644 refer toNothofagus (asFagus).
2. Cheeseman, T. F. 1925. Manual of the New Zealand Flora, ed. 2. Wellington; on pp. 373, 374 is a brief account of hybridism inNothofagus byL. Cockayne. Cheeseman speaks of hybridism in this genus as ?a remarkable fact?.
3. Cockayne, L. 1909. Report on a Botanical Survey of Stewart Island. Wellington; pp. 33, 34 deal with the question of presence or absence of species in certain localities.
4. Cockayne, L. 1917. A consideration of the terms ?Species? and ?Variety? as used in Botany with Special Reference to the Flora of New Zealand. Trans. N. Z. Inst. 49 p. 66?79; on p. 74 it is suggested that intermediate forms connecting species are hybrids.
5. Cockayne, L. 1921. The Southern-beech (Nothofagus) Forests of New Zealand. N. Z. Journ. Agric. 23 p. 353?360; tells of the discovery of extensive hybrydism inNothofagus and illustrates many of the juvenile forms.