臺灣石松莖解剖紀要

Selaginella stem anatomy additional notes on Taiwan species

In the last issue of Taiwania we discussed the Selaginella of Taiwan. A key, based on stem anatomy characters, was given to the known species, and descriptions of the anatomy of each was given. This study is still being continued. Plate I gives illustrations of six species. S. doderleinii Hieron. Shows a stem without an aerenchyma zone. The cortex has an outer thick walled, lignified zone and an inner parenchyma zone which extends to the stele. S. leptophylla Baker has a wide aerenchyma zone and narrow trabeculae connecting the thin walled cells of the cortex to the stele. S. dclicatula (Dcsv.) Alston shows a stem with 3 vasular bundles each with a distinct endodermis and a narrow aerenchyma zone surrounding the amphicribal vascular bundles.