Origin and Development of Tissues in Rhizome of Pteris aquilina

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Abstract
1. The structure of Pteris rhizome is unmistakably and invariably dorsiventral. 2. In shape the apical cell of the rhizome is a modified form of the dolabrate type. 3. The apical arrangement is considered to be adaptive to the subterranean habit. 4. The endodermis and pericycle have a common origin and both layers are stelar. 5. The protophloem sieve tubes and the phloem parenchyma are derived from a common mother cell, which in turn has a common origin with the mother cell of the endodermis and the pericycle. 6. Protoxylem, metaxylem, wood parenchyma, and metaphloem were traced also, so far as the identity of their cells was recognizable. 7. The development of xylem lags behind that of phloem in all except the lower peripheral bundles. This difference in development is considered to be due to the subterranean habit of the rhizome 8. The adventitious root develops extremely early. Its apical cell originates in the outermost layer of the plerome soon after its differentiation from the periblem. 9. The results of the present investigation on the origin of the endodermis and adventitious root do not agree with the descriptions in the older works.

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