238 
pored libriform, Azbes has both kinds. | These two genera, how- 
ever, present such morphological differences as to be classed by 
some authors in separate families. Hydrangea and Deutzia have 
bordered pores. In Deutzia the bor- 
A 
RE a) ders are not as large as in other gen- 
4 $c) era, but the pores are very numerous, 
: several lying on the same wall of a 
) cross-section, as seen in fig. A. 
ae: 
Of Zygophylleze only a few speci- 
mens could be obtained. Of those 
ony ates. examined, Zribudus has only simple, 
Guaicum only bordered, and Zygophyllum, both kinds of pores. 
In Ranunculacese, Clematis has only simple pores (these, 
however, are very numerous), while Adonis and Paonia have 
bordered pores. 
In Tiliaceze, the genus Corchorus has libriform pores possess- 
ing borders of medium size. The other genera examined contain 
only simple-pored libriform. In Caprifoliacee, Viburnum has 
only bordered, Sambucus only simple pores. 
This leaves only two more families belonging to this category, 
viz: Solanacez and Scrophulariacez. All the genera examined 
of the family Solanacee, except Brunfelsia and Franciscea, 
agree in having simple-pored libriform. These two genera have 
both kinds of pores in this tissue, the bordered element pre- 
dominating over the simple. Endlicher classes these two genera 
with Scrophulariacee. With the members of this family they 
agree not much better, though one genus of Scrophulariacee 
examined contains both kinds of pores. Also the different 
genera of Scrophulariacee vary from each other in the number 
of elements of the woody tissue much more than those of 
Solanaceez. This is so striking as to deserve particular men- 
tion. 
As before stated, all the genera of the family Scrophu- 
lariacee, examined except Freylinia, contain libriform with only 
simple pores. In Veronica, Chelone and Digitalis, tracheze and 
libriform cells form the entire woody tissue. We have previously 
mentioned Veronica as being the only example where both medul- 
dary rays and wood parenchyma cells fail. This is not strictly true, 
