104 THE JOURNAL OF INDIAN BOTANY. 



cavities with a lining layer of cells and with pinkish contents in 

 Gossypium herbaceum. Oxalate of lime is found in the form clustered 

 crystals in the soft bast in Sida greiuioides and Gossypium herbaceum 

 (fig. 60) in the cork, eollenchyma, soft bast and pith of Abutilon fruti- 

 cosum (fig. 56) and in the eollenchyma of Hibiscus micranthus (fig. 58). 

 Oxalate of lime does not occur in any form in Pavonia arabica. 



Anamolous structures are represented by vascular bundles in the 

 pith of Abutilon fruticosum as already mentioned. 



General Review: — Epidermal cells are tabular with outer walls not 

 much thickened. Large water-storing cells are intercalated amongst 

 the ordinary epidermal cells in Hibiscus micranthus (fig. 57). Guard- 

 cells are usually a little elevated. The front cavity is depressed. 

 A dense covering of tufted hairs occurs on the leaves and young bran- 

 ches. External glands are either club-shaped (tig. 57), pitcher-shaped 

 (fig, 54) or spherical (fig. 59) ; they are usually placed in epidermal 

 depression. 



The mesophyll is composed of palisade tissue on the adaxial side 

 and of arm-palisade tissue on the abaxial side. Internal secretory 

 organs occur in the leaf and axis in the form of secretory cells or 

 secretory cavities. The veins are embedded except the larger ones in 

 Abutilon fruticosum ; they are provided with bundle-sheaths. Oxalate 

 of lime is found in the form of clustered crystals in the leaf and axis, 

 The assimilatory tissue in the axis is either composed of palisade 

 tissue or of chlorenchyma. The cortex is usually strengthened by 

 eollenchyma. The cork is subepidermal. The pericycle is formed of 

 rhomboidal groups of stone-cells. Numerous small groups of bast 

 fibres are found in the soft 'bast of Sida greiuioides and Pavonia 

 arabica* The wood forms a composite hollow cylinder. The vessels 

 are small and few. Interfascicular wood prosenchyma is not ex- 

 tensive. Medullary rays are 1-3 seriate. Vascular bundles occur in 

 the pith of Abutilon fruticosum. The pith is formed of thin-walled 

 cells. 



STERCULIACEAE. 



Melhania Denhamii Br. Pigs. 61, 62. Lower surface of 

 leaf deeply furrowed. Mesophyll formed of short palisade cells on 

 the adaxial side and of arm-palisade ones on the abaxial side. Upper 

 epidermal cells with tanniniferous contents. Numerous mucilage 

 canals in the pith. Solitary crystals in the leaf and axis. Clothing 

 hairs tufted. Glandular hairs club-shaped. Pericycle formed of an 

 outer loose ring of stone-cells and of an inner loose ring of bast fibres. 

 Vessels large. Medullary rays 1-3 seriate and broadening outwards 

 in the form of wedges between the groups of soft bast. 



