How to translate text using browser tools
22 September 2015 Use of Gemma Characters to Identify North American Huperzia (Lycopodiaceae)
Arthur V. Gilman
Author Affiliations +

All North American firmosses (Huperzia: Lycopodiaceae) produce highly specialized vegetative propagules known as gemmae. Though gemmae are of interest to morphologists, they have been used only rarely as aids in identification. To improve understanding of their variation among North American species and to explore their systematic utility we surveyed gemmae of all species in North America north of Mexico and provide measurements, comparative descriptions, and images. Several characters of the gemmae, including their size, shape, and morphology of the leaves that comprise them vary considerably across the species studied and can be used to distinguish species. A dichotomous key based on gemma characters is provided, and several notable range expansions are reported. We anticipate this study will help resolve confusion regarding the identity of North American Huperzia species, particularly among the taxa in the northern and western regions of the continent, which remain poorly understood.

© 2015 American Fern Society
Arthur V. Gilman "Use of Gemma Characters to Identify North American Huperzia (Lycopodiaceae)," American Fern Journal 105(3), 145-161, (22 September 2015).
Published: 22 September 2015
Get copyright permission
Back to Top