EXPLANATION OF PLATE I. 



Pectinella antarctica. 



Fig. 1. — Vertical section of female floAver at about the same stage 

 as fig. 2. 



2. — Young female flower (from long-leaved variety). 



3. — Female flower after fertilization (from short-leaved 

 form). 



4. — Female flower further advanced, with one abortive 

 carpel. 



5. — Vertical section of same. 



6. — The same, still further advanced: a, a, anterior and 

 smaller lobes; h, h, posterior lobes; Cj membranous 

 bracts, few and scattered in fig. 1, obsolete in fig. 2, 

 united in a cup in figs. 3, 4, 5, and 6, but cut back 

 in 4 and 5; d,d, hornlike processes growing on the 

 upper part of the carpel and perhaps helping to 

 shelter the emerging embryo; e, style of abortive 

 carpel ; /, style of fertile carpel ; g, embryo with 

 plumule emerging from fruit; j, horny tissue of 

 carpel, which becomes the comb ; k, embryo in earlier 

 stage; /. albumen surrounding lower part of embryo. 



7. — The quadripartite comb. 



8. — Embryo. 



9. — Embryo further developed : h, cotyledon ; i, plumule ; 

 m, hypocotyl. 



10. — Male flower enclosed in leaf-sheath (long-leaved variety). 



11. — Transverse section of anthers. 



12. — Anthers opening. 



13. — A pollen-cell. 



14. — Young plant rising from the comb and rooting itself. 



15. — Branch with female flower at summit. 



16. — Transverse section, showing anthers dehiscing in 3 

 valves and practically 1-celled through absorption of 

 the partitions. 



