Permineralized fruits of Diplopanax (Cornaceae, mastixioideae) from the middle eocene princeton chert of British Columbia

Ruth A. Stockey, Ben A. Lepage, Kathleen Pigg

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

Over 80 specimens of a permineralized fruit referable to the Cornaceae (Mastixioideae) have been recovered from the middle Eocene Princeton chert (Allenby Formation) of British Columbia, Canada. Specimens were studied using a modified cellulose acetate peel technique using hydrofluoric acid. Diplopanax eydei Stockey, LePage et Pigg sp. nov. has fruits with endocarps up to 11 mm long and 10 mm in diameter that have a smooth stone surface, a single locule that is U-shaped in cross section, and a germination valve that extends nearly the full length of the fruit. An epicarp (exocarp + mesocarp) composed of thin-walled parenchymatous cells, 1.2-1.5 mm thick, is preserved on one specimen. Remnants of an apical disc with possible perianth scars are seen in three specimens. The endocarp is composed of interlocking fibers with scattered resin ducts and vascular tissue that parallels the edges of the valve. Seed integuments consist of a single external layer of large cells with brown contents and an inner zone of two to four thin-walled cells of smaller diameter lacking contents. Numerous septate fungal hyphae are usually present in the integumentary layers. These fruits represent the first reported fossils of the genus Diplopanax Handel-Mazzetti, and the northernmost known mastixioids in North America. The fruits are compared to those of other living and fossil mastixioids including Mastixicarpum Chandler and add to our knowledge of the diversity and distribution of the North American mastixioids during the Tertiary.

Original languageEnglish (US)
Pages (from-to)223-234
Number of pages12
JournalReview of Palaeobotany and Palynology
Volume103
Issue number3-4
DOIs
StatePublished - Oct 1 1998

Keywords

  • British Columbia
  • Cornaceae
  • Diplopanax
  • Eocene fruits
  • Mastixia
  • Mastixicarpum

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Palaeontology

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