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Science 9 February 1968:
Vol. 159. no. 3815, pp. 648 - 650
DOI: 10.1126/science.159.3815.648
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Articles

Somatic Reduction in Cycads

William B. Storey 1

1 Department of Horticultural Science, University of California, Riverside

Recurrent somatic reduction is a normal ontogenetic process in apogeotropic roots of cycads, which develop into dichotomously branching coralloid masses. The reduced cells make up part of a ring of differentiated cortical tissue lying midway between the pericycle and the epidermis; they serve as fillers among the large cells and become charged with slime. The differentiated tissue is colonized by a species of blue-green algae.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)