Cytological problems in Lycopodium sens. lat

Homosporous pteridophytes differ from seed plants most strikingly in their potential ability to produce completely homozygous offspring from a single haploid spore. The Lycopodiaceae share this characteristic with the ferns, but differ from them in the absence of apogamy and in the relatively high f...

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Bibliographic Details
Published in:Annals of the Missouri Botanical Garden 1992, Vol.79 (3), p.718-729
Main Author: Wagner, F.S. (University of Michigan, Ann Arbor, MI)
Format: Article
Language:English
Subjects:
Biological and medical sciences
Biological taxonomies
CHROMOSOME NUMBER
Chromosomes
CITOLOGIA
CYTOLOGIE
CYTOLOGY
Ferns
Fundamental and applied biological sciences. Psychology
Gametophytes
Hybridity
NOMBRE CHROMOSOMIQUE
NUMERO DE CROMOSOMAS
Plant cytology, morphology, systematics, chorology and evolution
Ploidies
PLOIDY
Polyploidy
PTERIDOPHYTA
Spores
The Lycopsida: A Symposium
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Summary:Homosporous pteridophytes differ from seed plants most strikingly in their potential ability to produce completely homozygous offspring from a single haploid spore. The Lycopodiaceae share this characteristic with the ferns, but differ from them in the absence of apogamy and in the relatively high frequency of allohomoploid nothospeciation in certain genera. Determining chromosome numbers in this family is often difficult, and discrepancies are found in published accounts. Evidence in support of a base number of 11 is presented. Allohomoploid nothospeciation is described involving four species of Diphasiastrum. A table giving the published chromosome numbers in Lycopodium sens. lat. is included.
ISSN:0026-6493
2162-4372
DOI:10.2307/2399761