237 
ulaceze, Myrsinee and Plumbaginez, all of which have only sim- 
ple pores. The second group is Bicornes, containing Epacridex, 
Ericacez, Vaccinee, Rhodoracee and Hypopityacez, which con- 
tain only bordered pores. The latter family is not given in the 
list, because the only representatives of this family which were 
examined are placed by Bentham and Hooker in the milly 
Ericacez. 
These examples are perhaps sufficient to verify the statement 
made in reference to the classification of families. In regard to 
the agreement of genera, the tables show without further expla- 
nation that the genera of thirty-three families agree in having 
only simple pores; of eighteen in having only bordered ; of eight 
in haying both kinds, while out of the whole number, sixty- 
seven, only eight are found where genera do not agree.” A fur- 
ther description of these eight families will show that in most 
instances the morphological-systematic characteristics fail to in- 
dicate a very close relationship. 
In the family Oleacez, three genera by some authors con- 
sidered as sub-families, viz.: Syringa, Ligustrum and Fraxinus, 
vary from each other not only in regard to the presence or ab- 
sence of the border, but also in other respects. In Syringa the 
libriform tissue contains pores with unusually large well-devel- 
oped borders. Fraxinus has libriform with only simple pores, 
while Ligustrum has both kinds. The two latter genera differ 
widely in regard to the other elements of the woody tissue. 
That is, Ligustrum represents the most complex type, Fraxinus 
the mostsimple. Specimens of both were treated with Schultze’s 
macerating solution, and in /raxinus only trachez and simple- 
pored libriform were found. (Wood parenchyma and medullary 
ray cells are also present, as in all examples given where no 
special reference is made to them.) In Ligustrum, on the other 
hand, are found all the varieties of wood elements. As no sys- 
tematist claims for these two genera a very close degree of re- 
lationship, this difference in anatomical structure is not so strik- 
ing. Forsythia has large and well-developed borders in the} Pores 
of the libriform tissue. ae 
A parallel case is found \in ee re Ses. so ler as 
the libriform is concerned. Philadelphus has only bordered- 
