NOTES ON NEARCTIC HEPATICAE: XIII. THE GENUS TRITOMARIA (LOPHOZIACEAE) IN ARCTIC CANADA

• Published in: Canadian Journal of Botany
• Main Author: Schuster, Rudolf M.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1958
• Subjects: Plant Science; Arctic; Ellesmere Island; Canada
• Online Access: http://dx.doi.org/10.1139/b58-023; http://www.nrcresearchpress.com/doi/pdf/10.1139/b58-023

Only four species of Tritomaria Schiffn. have been described, all found in cold to boreal regions of the northern hemisphere. Of these, only T. quinquedentata (Huds.) Buch has been known from the arctic portions of eastern Canada. The range of this species in Canada east of the 100 meridian is tabulated, and two varieties, var. turgida (Lindb.) Weim. and var. grandiretis Buch and Arnell, are described from the same area. The latter variant is here first recorded from North America: it is presumably a polyploid, possessing larger cells and more numerous oil-bodies. T. heterophylla Schuster is described from materials from northernmost Ellesmere Island. It is allied to T. scitula, from which it differs in purplish pigmentation, broader than long leaves, and spinose-dentate perichaetial bracts. The last peculiarity serves to differentiate it from all other species of the genus. A key to all of the species and varieties, all known from eastern Canada, is given.