326 



On the other hand Schlechter^^^ states, that he and Dr. J. J. Smith have 

 traced in New Guinea several species of the Section Rhizobium, belonging to 

 Dcndrobium, which occur under exceptionally dry conditions for New Guinea, 

 and which without doubt point to an Australian origin. 



Two species of Pterostylis, R. Br., which is unquestionably an Australian 

 type, have also been recorded in that island, both from alpine localities ; one, 

 P. papuana, Rolfe, at a height of 12,200 feet in British Papua, and the other, 

 P. novo-guineensis, Ridley, at a height of from 8,000-11,000 feet in Dutch 

 Territory. Both of these have a strong resemblance to existing Australian 

 species. 



It is noticeable from our tables, that every epiphytic genus recorded in 

 Tropical Australia occurs also in the Archipelago or in New Guinea ; and further, 

 that the balance of those orchids common to these floral regions, and consisting of 

 terrestrial types, are about twice as numerous as the epiphytes. 



In the large islands lying north of the Equator, the Papuan-Malay elements 

 of our flora are still in strong evidence. This may be most easily studied in the 

 Philippines, where Mr. Oakes Ames *^*^ has submitted a vast amount of 

 orchidaceous material to critical examination. He says, however, in regard to 

 these islands, that "there are still large areas, botanically unknown, from which 

 it is highly probable that rich accessions to our orchid herbaria will be made."<^''^ 

 He admits 101 genera with 723 species. 



An examination of these genera shows that no less than 38 of them are 

 shared in common with Australia. These are as follows : — 



1. Habenaria, Willd. 15. Hetaeria, Bl. 27. Dendrohium, Sw. 



2. Thelymitra, Forst. 16. Corymhis (Corymbor- 28. Eria, Lindl. 



3. Microtis, R. Br. chis), Thou. 29. Bulbophyllum, Thou. 



4. Cryptostylis, R. Br. 17. Pholidota, Lindl. 30. Phreatia, Lindl. 



5. Galeola, Lour. 18. Microstylis (Malaxis),Zl. Dipodiuni, R. Br. 



6. Epipogiim, Gmel. Nutt. 32. Cymbidiiim, Sw. 



7. Nervilia, Comm. 19. Oberonia, Lindl. 33. Sarcochilus, R. Br. 



8. Didymoplexis, Griff. 20. Liparis, L. C. Rich. 34. Phalaenopsis, Bl. 



9. Gastrodia, R. Br. 21. Phajus, Lour. 35. Luisia, Gaud. 



10. Corysanthes, R. Br. 22. Calanthe, R. Br. 36. Vanda, Jones 



11. Spiranthes, Rich. 23. Spathoglottis, Bl. Z7. Cleisostoma (Pomato- 



12. Goodyera, Bl. 24. Pachystoma, Bl. calpa and Tricho- 



13. Anoectochilus, Bl. 25. Eulophia, R. Br. glottis), Bl. 



14. Cheirostylis, Bl. 26. Geodorum, Jacks. 38. Taeniophyllum, Bl. 



Eight species occur also in Australia. These are : — 



1. Didymoplexis pallens, Griff. 6. Microtis parviflora, R. Br. 



2. Goodyera viridiflora, Bl. 7. Luisia teretifolia, Gaud. 



3. Pholidota imbricata, Lindl. 8. Spiranthes australis, Lindl. {^S. sin- 



4. Oberonia iridifolia, Lindl. ensis, Ames) 



5. Phaius grandif alius, Lour. 



The first of these lists, as might have been expected, merely extends the 

 range of the Papuan-Malay types, eliminating a few, such as Zeuxine, 

 Ornithochilus, and Osyricera. It also eliminates a couple of Australian types, 

 Caladenia and Pterostylis. It is likewise interesting to note the retention of two 

 Australian genera, Thelymitra and Microtis, as well as the Australian section 

 Dendrocoryne of the genus Dendrobium, together with the doubtfully Australian 



(3) "Die Orchidaceen von Deutsch-Neu-Guinea" (1914), p. xviii. 



(4) Ames, "Orchidaceae," v. (1915). 



(^) Ames, "Orchidaceae," v. (1915), Pref., p. ix. 



