Abstract
Reanalysis of the segregation of a clumped-chloroplast trait in the fern Acrostichum danaeifolium, previously reported as 1.0 mutant to 1.2 wild type, shows the ratio to be 1:1. Segregation ratios may be altered by such factors as ungerminated spores, postmeiotic developmental irregularities, differential survival of genotypes, or unknown genetically controlled developmental events. Thus, segregation ratios in pteridophytes that deviate from Mendelian expectations require careful analysis.
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