CONIFER ALES 229 



EiCHLER'^s begins with the Araucariaceae. His sequence of 

 genera is as follows: 



I. I. Agathis, 2. Araiicaria. 



II. 3. Pinus, 4. Cedrus, 5. Larix, 6. Pseudolarix, 7. Picea, 8. Tsuga, 

 9. Abies. 



III. 10. Sciadopitys, 11. Cunninghamia, 12. Arthrotaxis, 13. Sequoia, 14. 



Cryptomcria, 15. Taxodium, 16. Glyptostrohus. 



IV. 17. Actinostrobiis, 18. Callitris, 19. Fitzroya, 20. Thujopsis, 21. Z,t6t»- 



cedrus, 22. Thuja, 23. Cupressus, 24. Chamaecy peris, 25. Juniper us. 

 V. 26. Saxagothea, 27. Microcachrys, 28. Cephalotaxus, 39. Dacrydium. 



VI. 30. Phyllocladus, 31. Ginkgo, 32. Cephalotaxus, 2,2)- Torreya, 34. Taxus. 



PseudotsMga, Keeteleria, Taiwania, Widdringtonia, Pherosphaera, 

 Acmopyle, and Polypodiopsis, have been added since Eichler's 

 account, partly by discovery and partly by sphtting other genera. 

 It is interesting to note the position assigned to Ginkgo. 



PiLGER/52 in the 1926 edition of Z)?e naturlichen Pflanzenfamilien, 

 has more genera, arranged in a different order: 



I. Taxaceae. Torreya, Taxiis, Austrotaxus. 



II. PoDOCARPACEAE. Pherospkaera, Microcachrys, Saxogothea. Dacrydium, 

 Acmopyle, Podocarpus, Phyllocladus. 



III. Araucariaceae, Araucaria, Agathis. 



IV. Cephalotaxaceae. Cephalotaxus, Amenotaxus. 



V. Pinaceae. Abies, Keeteleria, Pseudotsuga, Tsuga, Picea, Pseudolarix, 



Larix, Cedrus, Pinus. 

 VI. Taxodiaceae. Sciadopitys, Sequoia, Taxodium, Glyptostrohus, Crypto- 

 mcria, Arthrotaxis, Taiwania, Cunninghamia. 



VII. CuPRESSACEAE. ActUiostrobus, Callitris, Tetraclinis, Callitropsis, Wid- 

 dringtonia, Fitzroya, Diselma, Thujopsis, Libocedrus, Fokienia, Cupressus, 

 Chamaecy paris, Arceuthos, Juniper us. 



Pilger's work is primarily taxonomic, but the geographic dis- 

 tribution is treated very thoroughly, and morphology is well pre- 

 sented. The bibliography is very complete. 



BucHHOLZ^' has recently rearranged the genera and families. For 

 several years he has been making an extensive examination of the 

 order and no previous investigator has ever studied such a wide 

 range of material prepared for morphological study, especially for a 

 study of the embryogeny. 



Every student of the group has realized that there are two groups 

 which can be called families or suborders or something else. One 



