Extent of vegetative reproduction in eleven species of Sphagnum from northern Michigan

TitleExtent of vegetative reproduction in eleven species of Sphagnum from northern Michigan
Publication TypeJournal Article
Year of Publication1977
AuthorsLane DM
JournalMichigan Botanist
Volume16
Pagination83-89
KeywordsVEGETATIVE REPRODUCTION
Abstract

Mass samples of 11 species of Sphagnum collected in northern Lower Michigan were sorted, counted, and analyzed by simple statistics to determine the extent of vegetative reproduction. From a total sample of nearly 20,000 apices representing a total area of about one square meter, three means of vegetative reproduction were identified: dichotomous branching of the stem, juvenile forms, and stem and branch innovations. The percentage of each category of the total number of growing points was calculated and compared by species, habit, and habitat. The exclusive means of the rare S. wulfianum which grows in erect clumps was dichotomous branching. Species known to have loose habits, S. recurvum and S. teres, were found to have few dichotomies. Species growing in wet hollows, S. cuspidatum and S. riparium, tended to have juvenile forms as a primary means of asexual reproduction. A shift from juvenile forms to dichotomous branching as a primary means was noted along the gradients of environmental factors from hollow to hummock species, respectively. Several lines of evidence make it unlikely that Sphagnum capitula all dichotomize every year. The origin of 'juvenile forms' remains in question.