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INTROGRESSION IN TRICHOMANES
Author(s) -
Bierhorst David W.
Publication year - 1977
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1977.tb10815.x
Subject(s) - biology , fern , introgression , context (archaeology) , habitat , population , deserts and xeric shrublands , botany , evolutionary biology , ecology , genetics , paleontology , gene , demography , sociology
Anderson's graphic method of population analysis applied to a number of specimens of Trichomanes sect. Selenodesmium points to introgressive hybridization between T. polystromaticum and T. dentatum. The two species, one of which grows in a xeric habitat and the other in a very protected mesic one, tend to maintain their specific integrities in their extreme habitats. Intermediate forms which tend to grow in intermediate habitats give indication of genetic imbalance in the form of diad spore production. Peculiarities of the fern and in particular of the hymenophyllaceous life cycle are discussed in the context of hybridization.