448 
Journal of Agricultural Research 
Vol. I, No. 6 
Family. Genera. 
Cupuliferae or Fagaceae.Castanea, Fagus, Quercus. 
Juglandaceae.Hicoria Juglans. 
Papilionaceae.Robinia. 
Magnoliaceae.Liriodendron, Magnolia. 
Moracese..Morns, Toxylon. 
The arrangement of wood parenchyma cells in the annual ring has 
been divided 1 into three different types, as follows: 
1. Terminal parenchyma, which is situated at the periphery of the annual growth 
ring, on the outer face of the summer wood. 
2. Metatracheal or diffuse parenchyma, which is scattered among the other ele¬ 
ments in the ring, usually forming tengential bands. 
3. Paratracheal or vasicentric parenchyma, or parenchyma cells, aggregated around 
the vessels. 
Table I .—Native woods grouped according to the degree of tylose development and the 
most marked distribution of wood parenchyma in ring . 2 3 
Abundant Tyloses . 3 
Species. 
Type of 
parenchyma. 
Species. 
Type of 
parenchyma. 
Catalpa speciosa. 
Paratracheal. 
Do. 
Do. 
Do. 
1 Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Hicoria orata. 
Paratracheal. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Chilopsis linearis. 
Juglans cinerea 
Morns rubra. 
* nigra 
Rhus hirta. 
Quercus alba 
Robinia pseudacacia. 
garryana . 
Toxylon pomiferum. 
lyrata. 
Hicoria alba. 
lohata 
aquatica. 
macrnearpa 
glabra. 
michauxii . . 
lacinosa. 
minor. 
minima. 
platanoides 
myristicaeformis. 
densiflora 
odorata. 
marilandica 
Many Tyloses. 
Castanea dentata. 
Fraxinus lanceolata . . 
Paratracheal. 
Do 
Celtis occidentalis. 
.j Paratracheal. 
profunda 
Eucalyptus globulus. 
.| Do. 
quadran gulata 
Do. 
Do. 
Fagus atropunicea. 
Sassafras sassafras. 
Fraxinus americana. 
Scattered Tyloses. 
Aesculus vetandra. 
Scanty para¬ 
Platanus occidentalis 
Metatracheal 
tracheal. 
Populus grandidentata. 
Terminal. 
Liquidambar styraciflua. 
Metatracheal. 
tremuloides 
Do 
Liriodendron tulipifera. 
Terminal. 
trichocarpa 
Do. 
Magnolia acuminata. 
Do. 
Ulmus alata. 
Paratracheal. 
fraseri. 
Do. 
americana 
Do 
glauca. 
Do. 
pubescens 
Do. 
1 Jeffrey, E. C. A Natural Classification of Woods. 
Holden, Ruth. Some features in the anatomy of the Sapindales. In Bot. Gaz., v. 53, no. 1, p. 50-58, 
pi. 2-3. 1912. 
2 The data here given concerning the distribution of parenchyma were obtained from: (1) Solereder, 
Hans, op. cit.; (2) Jeffrey, E. C., op. cit.; and (3) from original observations made during the study. 
3 By “abundant” is meant a very large number. “Many” is aised to signify a considerable number 
but less than 1 ‘ abundant.” 
