Czekanowski's fan-maidenhair tree (Baiera czekanowskiana)

Baiera czekanowskiana - Mesozoic Fossil Plant Species

Discovery of Baiera czekanowskiana fossilized foliage provides valuable paleobotanical evidence regarding prehistoric plant distributions. This extinct species lived during the Jurassic period, leaving its leaf compressions in Siberian and East Asian geological formations. It inhabited temperate wetland ecosystems, coexisting with ancient ferns and seed ferns.

The species represents an important evolutionary link in gymnosperm leaf morphology. Its fossils help researchers map the migration patterns of ancient northern hemisphere floras.

Taxonomy

Morphology

The foliage displays a typical wedge-shaped outline, which is deeply divided into multiple slender lobes. These slender segments contain parallel veins that branch dichotomously toward the tips. The leaf cuticle is highly resistant, protecting the internal cell structure from decay during fossilization.

Microscopic studies of the epidermal patterns show stomata arranged in distinct bands. This distribution suggests a highly regulated transpiration mechanism suited to seasonal humid environments.

Interesting facts

The species was named to honor the prominent Polish-Russian explorer and geologist Aleksander Czekanowski, who collected extensive fossil material in Siberia. The leaves are frequently found clustered together in sedimentary layers, indicating they were shed seasonally like modern deciduous trees. Analyzing the cuticle thickness of these fossils helps scientists estimate the levels of prehistoric atmospheric carbon dioxide.

Geography of distribution

  • Russia

Sources

  • Heer, O. (1876). Beiträge zur fossilen Flora Sibiriens und des Amurlandes. Mém. Acad. Imp. Sci. St.-Pétersbourg.
  • Czekanowski, A. (1873). Geological investigations in the Siberian region.
  • Harris, T. M. (1935). The Fossil Flora of Scoresby Sound, East Greenland. Meddelelser om Grønland.