The pith flecks of Annona squamosa and Walsura piscidia wcre comparcd with rcfcrcnce to thcir structural organization and to thcir cffcct on the adjacent wood. In both cases, thc flccks wcrc causcd by thc mining activity of cambium mincrs of the insect group Agromyzidae. In both, flccks wcrc composcd of parenchymatous clcments dcrivcd partly from ray and partly from axial parcnchyma adjoining thc minc. Thcre were more flecks per unit arca of wood in Annona than in Walsura, A fcw diffcrenccs wcre observed bctwccn the flecks of the two plants and thcsc includc (1) prcscncc of some unfillcd or partially filled mined tunncls in Annona, (2) abscnce of starch grains in the cclls of fleck in Walsura, (3) thinncr bordering nccrotic laycr around the fleck in Walsura, and (4) abscnce of pcctin in thc fleck ccll wall in Walsura. The wood adjacent to pith flccks in Annona showcd an incrcasc in thc hcight and width of rays. These differenccs, however, were not noticcd in Walsura, probably bccausc of thc limitcd numbcr of flccks per unit arca of wood.
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