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Sinker Structure Of Phoradendron Californicum (Viscaceae) Confounds Its Presumed Close Relationship To Other Acataphyllous Species, Rudolf Schmid, Clyde L. Calvin, Carol A. Wilson
Sinker Structure Of Phoradendron Californicum (Viscaceae) Confounds Its Presumed Close Relationship To Other Acataphyllous Species, Rudolf Schmid, Clyde L. Calvin, Carol A. Wilson
Aliso: A Journal of Systematic and Floristic Botany
Phoradendron is the largest genus of New World mistletoes, with about 250 species in two subgenera, Boreales and Aequatoriales, corresponding, respectively, to northern acataphyllous and southern cataphyllous groups. The typically acataphyllous P. californicum of western North America is controversial because recent phylogenetic work has nested it in the southern cataphyllous clade. Seedling establishment, stem anatomy, and endophytic system structure of this species were studied. Seedling haustorial holdfasts have gland cavities, structures considered absent in the Viscaceae clade of Santalales. The stem epidermis has a thick cuticle, deeply sunken stomata, and branched multicellular trichomes. The stem has an outer cortex …