Root Structure in the Fern Platycerium bifurcatum (Cav.) C. Chr. (Polypodiaceae)

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Abstract

The cortex of Platycerium bifurcatum roots has an unusual anatomy. A thick sclerenchyma sheath in the inner cortex is interrupted opposite each protoxylem pole by a large cell whose inner tangential wall is thickened where it is in contact with the endodermis. This thickened wall is interrupted by numerous simple pits. The endodermal cell interior to each idioblast lacks a Casparian strip and suberin lamellae. In a Calcofluor uptake experiment conducted with excised roots, Calcofluor was readily transported into the stele. These endodermal cells appear, therefore, to be a possible pathway for apoplastic movement of substances into the stele. Lateral root primordia are initiated in the stele opposite the sites of the large cortical idioblast.

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