LEJEUNEA GRADSTEINII (LEJEUNEACEAE), A NEW LIVERWORT SPECIES FROM MT . KINABALU, SABAH

Abstract

Lejeunea gradsteinii is described and illustrated as a new species from Mt. Kinabalu, Sabah. The plant stands out by 1) lobules with flat free margin and 2 teeth, the first tooth consisting of (1)-2 cells, 2) whitish-green plant color, 3) weakly crenulate margins of leaves, underleaves, female bracts and bracteoles, 4) basal cells of leaf lobes forming a weak vitta, 5) well-developed trigones and scarce intermediate thickenings, 6) deeply bifid underleaves (to 2/3) with rounded tips, 7) long male shoots with up to 13 pair of bracts, and 8) longexserted, obovate-clavate perianths with 5 sharp keels ending into short auricles. Lejeunea gradsteinii is most closely related to L. kodamae Ikegami et Inoue and L. bidentula Herzog, all of which have 2-toothed lobules.