96 MICROSCOPICAL RESEARCH 



PLATE XIII. 



LEAF STRUCTUEE. 



Fig. 45. Transverse section. ' Phyllode.' 'Acacia decurrens ' x 60 

 dia. Fixed with Clironio - Acetic solution. Stained 

 with. Aniline -picrate and Gossypimine. 1. Epidermis. 



2. Stoma. 3. Palisade layer, containing chloroplasts, 

 stained blue. 4. Vascular bundle. 5. Smaller vascular 

 bundles — a, xylem elements of bundle; h, cambium; 

 c, phloem, all having become lignified. 



Fig. 46. Transverse section. 'Cladode' of 'Euscus aculeatus' 



X 35 dia. Fixed with Chromo-Acetic solution. Stained with 



Aniline-picrate and Gossypimine. 1. Epidermis. 2. Ground 



tissue (spongy parenchyma). 3. Primary vascular bundle. 



4. Stoma. 5. Smaller vascular bundle. 



• 

 Fig. 47. Transverse section. Leaf Bud of Beech Tree. 'Fagus 

 sylvatica ' x 25 dia. Fixed with Chromo-Acetic solution 

 (Celloidinised preparation). Stained with Borax Carmine. 

 1. Protective bracts or scales. 2. Internal bud scales. 

 3 — 7. Complete young leaf in section — 3, leaf -blades; 

 4, midrib; 5, 6, 7, lateral veins. 



Fig. 48. Transverse section. Leaf Bud of Ash Tree. ' Fraxinus 

 excelsior ' x 25 dia. Fixed with Chromo-Acetic solution. 

 Stained with Borax Carmine. 1. — 2. Imbricate bud scales. 



3. Petiole of oldest leaf, leaf-blade being cut away in 

 previous sections. 4. Vascular system of same. 4a. Petiole 

 of secondary leaf, the complete leaf inclosed in dotted 

 outline. 6 — 7. Developing leaves. 



