You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Sex-Specific Germination Response in the Liverwort Sphaerocarpos texanus (Sphaerocarpaceae)
D. Nicholas McLetchie
Vol. 104, No. 1 (Spring, 2001), pp. 69-71
Published by: American Bryological and Lichenological Society
Stable URL: http://www.jstor.org/stable/3244916
Page Count: 3
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
The sexually dimorphic liverwort, Sphaerocarpos texanus, can be used to study changes in sex ratios in a cohort of individuals during different life stages, from spore development to germination to senescence. Recent attempts to germinate spores under controlled conditions have been successful. This study used laboratory-derived spores to detect subtle sex-specific differences in germination in a cohort of spores across different dormancy breaking temperatures. Sex ratios were determined for subsets of sporelings held at 35/20, 30/15, and 25/15°C for one to eight wk. Sex ratios were female biased for spores that lost dormancy in the 25/15°C and when the data were pooled across the three dormancy breaking thermoperiods. This pattern coupled with the potential for spore banks formation in S. texanus can lead to a single cohort of spores influencing the sporeling sex ratios across seasons.
The Bryologist © 2001 American Bryological and Lichenological Society