Reproduction.

Insects are believed to be the fertilising agents in Corybas, but little information is available concerning the exact procedure. Plants of C. trilobus, grown under controlled conditions by the writer, produced ripe capsules by self-fertilisation, but whether this method is at all common in nature is rather doubted. In most of the species the flowers are borne on a few small plants which appear early in the season. After a week or so, larger flowerless plants appear, these latter forming, especially in the case of C. trilobus and macranthus, the greater part of the colony. It has been estimated that in an average colony of C. trilobus only 1 per cent. of the plants bear flowers. Of this 1 per cent. perhaps a twentieth produce ripe capsules. As a consequence, or perhaps as a contributory cause, vegetative