The stem under the microscope
The examined material had a single-layered epidermis with an even surface, and stomata lay level with neighbouring cells. Viewed from above, however, the surface showed a network-like pattern. This was produced by local thickening of the cuticle, the protective layer covering the epidermis. The resulting appearance differs from actual depressions between cells in other species. Interpreting the structure therefore requires comparing a surface view with a stem cross-section [Calvente et al. 2008].
Numerous mucilage-filled cavities occurred in the cortex and pith. The researchers also described a vascular cylinder with a quadrangular or circular outline. These observations came from material collected in Rio de Janeiro. In the six-species comparison, epidermal organisation was especially useful for distinguishing taxa. The presence of mucilage alone does not establish rates of water uptake or loss, because the investigation was anatomical [Calvente et al. 2008].
Germination and sensitivity of young plants
In the 2026 experiment, seeds germinated better at 20 °C than at 25 °C. Reduced water availability in PEG treatments strongly decreased germination, and some small groups of emerged seedlings did not survive. Recovery of germination after conditions improved was also poor in several treatments. Adult occurrence on rocky outcrops can therefore coexist with a seedling stage requiring a favourable moist period. The laboratory findings identify this relationship without establishing a watering schedule for cultivation [Gonçalo et al. 2026].
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Synonyms and names in the literature
Lepismium cereoides [2-WWW]
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