A new species of Phoradendron, Ph. mathiasenii, is described, and a range extension and host are given for Ph. tikalense. Both species are from Honduras and grow as epiparasites, i.e., mistletoes parasitizing other mistletoes. The parasitic host for both epiparasitic species of Phoradendron is Psittacanthus angustifolius (Loranthaceae), which in turn is parasitic on the terrestrial host, Pinus oocarpa, a common forest tree in the collection area. Although the two species of Phoradendron parasitize the same parasitic host and co-occur in the area, they are distinct morphologically. Many plants of Ph. mathiasenii were observed at several collection sites in the study area while plants of Ph. tikalense were observed at only one site.
Wiens, Delbert and Calvin, Clyde L.
"Two Epiparasitic Species of Phoradendron (Viscaceae) from Honduras: one New and for the Other a Range Extension and Host Determination,"
Aliso: A Journal of Systematic and Evolutionary Botany:
2, Article 5.
Available at: http://scholarship.claremont.edu/aliso/vol29/iss2/5