ULTRASTRUCTURAL STUDIES OF FOSSIL PLANT CUTICLES. II. TARPHYDERMA GEN. N., A CRETACEOUS CONIFER FROM ARGENTINA

1986/11/01 by Sergio Archangelsky, Sérgio Archangelsky, Thomas N. Taylor · 16 citations
Agricultural and Biological Sciences · #Plant Diversity and Evolution #Fern and Epiphyte Biology #Plant Taxonomy and Phylogenetics

paper · doi:10.1002/j.1537-2197.1986.tb10909.x

Abstract

Tarphyderma glabra is a leafy shoot of early Cretaceous age from Santa Cruz, Argentina. The leaves, often found isolated, are hypostomatic with the guard cells more or less deeply sunken in suprastomatal chambers. Each chamber is formed by a ring of irregularly elongated cells that may have regulated the opening of the stoma. The cuticle membrane of both the upper and lower surface is thick and can be subdivided into distinct layers based on ultrastructural features and position on the leaf. A cutinized hypodermis is present. The plant, a conifer of uncertain affinities, is compared with other taxa characterized by deeply sunken guard cells.

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