RECORD: STRUCTURE OF CERTAIN WOODS aoe 
not, while the vertical elements of the secondary phloem are in 
horizontal seriation. The distinctness of the cross-lines in the 
inner layers of phloem was found to be largely due to highly re- 
fractive callus on the sieve plates. 
The storied structure of wood occurs throughout a consider- 
able range of families and orders as will appear from the following 
list, which is arranged according to the Engler and Gilg (1912) 
system of classification. The first numeral following the family 
refers to the number of different genera in which the feature has 
been noted by the writer; that in parentheses, to the total number 
reported. 
. UrtIcCALES: Ulmaceae, 1 (1); Moraceae, I (I). 
‘ oe Amarantaceae, I (I). 
: Moringaceae (1). 
. ROSALES: faes (7); Leguminosae, 4o (51). 
. GERANIALES: Zygophyllaceae, 3 (4); Rutaceae, 1 (1); Simarubaceae, 3 (4); 
Meliaceae, 6 (7). 
6. SAPINDALES: Hippocastanaceae, 1 (1); Sapindaceae (1). 
7. MALVALEs: Tiliaceae, 5 (8); Malvaceae, 4 (4); Bombacaceae, 3 (3); Ster- 
culiaceae, 7 (8). 
8. MyRTIFLORAE: Lythraceae, I? (12). 
9. EBENALES: Ebenaceae, I (1). 
. TUBIFLORAE: Bignoniaceae, 3 (3). 
Iz. CAMPANULATAE: Compositae, 3 (3). 
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Consideration of the above list leads to the conclusion that 
there is no close correlation between the form of wood structure 
under consideration and the various types of floral organization 
which serve as the basis for the classification followed. There 
seems to be a correlation, however, between this storied structure 
and certain types of differentiation of the wood elements. The 
vessel segments have abrupt ends and simple perforations, and 
the elongated or scalariform type of pitting is rarely found and 
then only in the tracheidal vessels and vascular tracheids. The 
wood fibers are for the most part provided with simple pits or 
with pits having only small and indistinct borders. The pits 
between vessels and parenchyma are usually small and _half- 
bordered. It is also interesting to note that with very few ex- 
ceptions (notably Aesculus, Cercis, Cytisus, Diospyros and Tilia) 
the woods are of tropical or subtropical origin. 
There is no family, with the possible exception of the Zygo- 
