PLATE XLIV. 



Gsertneria deltoidea Torr. 

 Fig. 3. Cross section of stem, x 100. 



Fig. 4. Cross section of pith, old stem, lignified, showing pits. X 575. 

 Fig. 5. Cross section, young unlignified pith, x 620. 

 Fig. 6. Cross section, young pith, showing chloroplasts. X 2300. 

 Fig. 7. Longitudinal section, pith, lignified. x 575. 



