228 STECKBECK— ON COMPARATIVE HISTOLOGY 



Explanation of Plates 

 Plate LVIII 

 Cassia nictitans showing the expanded day position of the leaves. 

 Cassia nictitans. Leaves in nyctitropic position. The leaves have dropped 

 and the leaflets are folded upward. 



Plate LIX 

 Section of leaflet of Pucraria Thunbergiana. Styloid type of crystal along 



veins and in mesophyll. 

 T. S. secondary pulvinus of leaflet of Pneraria Thtinhergiana crystals around 



vascular bundle cylinder and in cortex. 

 Section of leaf of Bauhinia diphylla. Scattered conglomerate cr>'stals and 



discontinuous lines of prismatic crystals along the veins. 



Plate LX 



Fig. 6. L. S. secondary pulvinus of Gymnocladus leaflet of Cymnodadus disica. 

 Conglomerate crystals scattered through the cortex and a broken line 

 of prismatic quadrangular crj'stals along the vascular bundle. 



Fig. 7. L. S. petiole of leaf of Robinia Pscudacacia showing elongated styloid and 

 prismatic types of crystals. 



Fig. 8. Surface section leaflet of Desmodium canescens. Lines of crystals along the 

 veins. 



Fig. 9. Macerated leaflet of Cassia nictitans. Lines of crystals along the veins. 



Fig. 10. L. S. petiole of leaf of Cassia nictitans. Crystals are mostly of the six- 

 angled rhombohedral type; others are quadrangular and a few styloid. 



Fig. 11. Section of leaflet of Mimosa Spegazzini. Lines of crj-stal cells. Crystals 

 are regular six-angled and enveloped in distinct protoplasmic sheaths. 



Plate LXI 



Fig. 12. Mimosa Spegazzini. Expanded day position of the leaves. 

 Fig. 13. Mimosa Spegazzini. Nyctitropic position of the leaves. 



Plate LXII 



Fig. 14. Oxalis florihunda. Day position of the leaves. 



Fig. 15. Oxalis florihunda. Nyctitropic position of the leaves. 



Plate LXIII 



Fig. 16. Biophylum dendroides. Day position of the leaves. 



Fig. 17. Biophytum dendroides. Nyctitropic position of the leaves. 



Fig. 18. Biophyium sensitivum. Day position of leaves. 



Fig. 19. Biophytum sensitivum. Nyctitropic position of leaves. 



Plate LXIV 

 Fig. 20. Section, leaflet of Biophytum defidroidcs. Many of the crystals are six- 

 angled and indicate a line across the middle. 

 Fig. 21. L. S. stem Oxalis Ortgicsi. Crystals scattered in cortex are intermediate 



between conglomerates and quadrangular prisms. 

 Fig. 22. Section leaflet Oxalis bupleurifolia. Crystals in mesophyll and along veins- 

 Fig. 23. Section oi leaQet Oxalis floribimda. Small crystals scattered through meso. 

 phyll tissue. 



