GENERA OF TAXACEH AND CONJFERZ. 27 
Resin-canals are present in the secondary liber. However 
characteristic these appearances may be they are ill-suited to 
the requirements of systematists and, indeed, are for the most 
part not available. 
The species are natives of Australia, Brazil, and some of the 
South Sea Islands. Numerous allied forms are found in a fossil 
condition from the Carboniferous strata through the Oolitic and 
Miocene periods, showing the type to be one of great antiquity 
and simplicity of organization, unless, on the contrary, the 
almost complete fusion of bract and seed-scale and the relative 
insignificance of the latter are to be taken as evidences of higher 
organization. 
Tribus IV. ABIETINEA, Benth. et Hook. iii. p. 423. 
Strobili feminei squame spiraliter dispositee manifeste duplices, e bracteis 
plus minusve liberis et e sporophyllis seu squamis seminiferis constantes. 
Semina 2 inversa libera. 
* Folia pro maxima parte homomorpha. 
Folia plana ad basin pulvinatim incrassata pulvinis 
decurrentibus ........--...-000, Subtribus I. Price z&. 
Folia petiolata a canali resinifero centrali soli- 
taria percursa; amenta strobilique parvi.. 19. TsuGa. 
Folia sessilia angulata vel plana, canalibus resin- 
iferis duobus Jateralibus vel nullis ; amenta 
strobilique majusculi..............006- 20. Picka. 
Folia ad basin haud pulvinatim incrassata. 
Rawi dimorphi alii elongati foliis sparsis, alii 
contracti foliis fasciculatis ...... Subtribus II. Larice&. 
Folia persistentia .......+... cece cece eee 21. CepRus. 
Folia decidua. 
Flores masculi solitarii amentiformes .... 22. LARIX. 
Flores masculi umbellatim aggregati .... 23. PSEUDOLARIX. 
Rami necnon folia sparsa homomorphi. 
Subtribus III. Sa pine #. 
Flores masculi umbellati ................ 24. KETELEEFRIA. 
Flores masculi solitarii vel racemosi. 
Strobili maturi squamz ab axi secedentes. 25. ABIES. 
Strobili maturi squame persistentes .... 26. PseuDoTsUGA. 
** Folia manifeste dimorpha, primaria sparsa, 
secondaria fasciculata ........ Subtribus [V. Pine «z. 
27. Pinus. 
