n = 4. Figs. 30-32.
The type species for section Comosum, H. comosum occurs in southem Australia (Victoria, Tasmania), New Zealand and (?) Norfolk Island. There are two varieties, var. comosum and var. sieberi (Touw, 1971). The chromosome number n = 4 was reported for a single population from Tasmania (Ramsay, 1983a) and is confirmed for another one in these studies (Table I, Appendix I). The four chromosomes included one smaller chromosome (Fig. 33) which behaved normally and could not be considered a micro-chromosome. The chromosome number was determined from metaphase I (Figs. 30, 31) and anaphase I of meiosis (Fig. 32). The four bivalents, aligned in Fig. 33 consist of two large, one intermediate and one smaller one. These are morphologically quite similar to those in H. dendroides (Ramsay, 1983a; these studies, Figs. 34, 35), but less so to H. comatum (these studies, Figs. 54-57).