1918] BLISS—TAXINEAE 59 
to the Podocarpineae, a family in which resin parenchyma is uni- 
versal. 
2. Resin parenchyma is present in less abundance in the stem of 
Torreya taxifolia, showing in this respect an intermediate position 
between Cephalotaxus and Taxus. 
3. Resin parenchyma is wholly absent in the normal stem of 
Taxus brevifolia, showing that this genus is the most modern one 
of the group. 
4. Resin parenchyma in the root of Taxus cuspidata and T. bac- 
cata and in the wounded stem of T. baccata indicates the ancestral 
condition in this genus. 
5. The Taxineae represent a modern group of conifers, as shown 
by the gradual reduction and final passing out of resin parenchyma 
in the more progressive organs. 
This investigation was carried on in the laboratories of Plant 
Morphology at Harvard University under the direction of Dr. E. C. 
JEFFREY, and I wish to express my thanks to him for his invaluable 
aid in the work and for the many courtesies extended to me during 
the year spent in his laboratory. 
Harvarp University 
CAMBRIDGE, Mass. 
LITERATURE CITED 
1. COULTER, J. M., and CHAMBERLAIN, C. J., Morphology of the spermato- 
phytes. roor. 
eae oa a iOS MBER 3910: 
3. DeBary, A., Pp g dferns. Oxford. 
1887. 
4. Enctrr, A., and Prantt, K., Natiirliche Pflanzenfamilien. 
5- JEFFREY, E. C., The cuiaparative anatomy and phylogeny ‘i oe Conifer- 
ales. I. The genus Sequoia. Mem. Boston Soc. Nat. Hist. 1903. 
6. PENHALLow, D. P., North American gymnosperms. 1907. 
EXPLANATION OF PLATES I, II 
PLATEI 
Fic. 1.—Transverse section of wood of stem of Podocarpus totara, X 250. 
Fic. 2.—Longitudinal radial section of wood of stem of same, X 250. 
Fic. 3.—Transverse section of wood of stem we Cephalotaxus drupacea, 
X 250. 
