226 



PLANT ORGANS OR PARTS OF PLANTS. 



fibres, wood fibres, spiral and annular ducts, tracheids, 

 crystals, epidermis of calyx lobes with stomata, tissue 

 from corolla, pollen grains, tissues of the seed, and if 





Fig. 63. — Cloves in Powder. 

 Epi.C, Epidermis of calyx showing oil glands beneath; Epi.F, 

 epidermis of corolla; E, epidermis of outer side of calyx teeth, with 

 stomata; CAL, cross-section of calyx (Epi.C), outer cuticularized wall 

 and collenchymatic tissue; P, parenchyma of body of cloves with 

 fibres, V vessels, and C crystals; PAR, parenchyma of fruit body in 

 cross-section, to right, and longitudinal section, to left, the latter 

 showing pitted parenchyma; ST, stone cells from the stem of the 

 cloves; Str, sclereids from the wall of the fruit; O, pollen grains; Fibr, 

 fibres from the clove stem; vessel from the clove stem; C.T, pitted 

 parenchyma from cotyledons; S, starch grains from seed. 



much stem has been included, the characteristic sclereids 



and bast fibres of this part of the fruit are in evidence. 



Bast fibres are conspicuous features in the powder; 



when unbroken, they measure from 300 to 400 microns 



