Abstract
Development of rhizoidal heads in Leucobryum martianumfrom Cerro Jefe, Panama, is reported for the first time. Leucobryum martianum (Hornsch.) Hampe is a moss species distributed throughout tropical Amer- ica. It grows in forests of low to high altitudes. In Panama, it occurs from sea level to elevations of over 1,000 m. The plants, 2-3 cm in height, grow in dense to loose turfs; the leaves are erect-crowded and falcate to falcate-secund. Like many other species of Leucobryum (Crum & Anderson 1981; Crum & Steere 1957), the leaves can serve as asexual dia- spores. Crum (1976) and Crum and Anderson (1981) have reported growth of rhizoids at the tips of leaves of Leucobryum glaucum (Hedw.) Angstr., suggesting that this character may be indicative of high poten- tialities for establishment of new plants from leaf fragments after dispersal. Production of rhizoids from leaves is of common occurrence in various
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