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Science 23 June 1978:
Vol. 200. no. 4348, pp. 1383 - 1385
DOI: 10.1126/science.200.4348.1383
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Articles

Evidence of Paleozoic Chromosomes from Lycopod Microgametophytes

SHEILA D. BRACK-HANES 1 and JACK C. VAUGHN 2

1 Division of Natural Sciences, Eckerd College, St. Petersburg, Florida 33733
2 Department of Zoology, Miami University, Oxford, Ohio 45056

A Pennsylvanian arborescent lycopod cone, Lepidostrobus schopfii, has microspores that have been found to have intracellular features that are interpreted as nuclei and mitotic chromosomes. The cellularized gametophytes conform to the early stages of growth that occur in modern Selaginella microgametophytes. Since the megagametophyte of L. schopfii is similar in development to extant species of Isoetes, the fossil now is known to have portions of its life cycle in common with both Selaginella and Isoetes.

Submitted on September 21, 1977
Revised on February 28, 1978


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
The Fine Structure of Fossil Plant Cell Walls.
E. L. Smoot, E. L. SMOOT, and T. N. TAYLOR (1984)
Science 225, 621-623
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Science. ISSN 0036-8075 (print), 1095-9203 (online)