Abstract
The lower surface of the leaf (macrocotyledon) ofM. horsfieldii is heavily calcified. SEM investigations reveal that the cristalline depositions of CaCO3 (mainly needles, but also clump-like structures) are excreted by the head cells of two-cellular trichomhydathodes. First, a cap-like structure is formed. As the excretion continues, the “cap” takes on the shape of a “hat with wide brim”. Thus, the dense layer of CaCO3 depositions is composed of hat-like structures whose brims at least partially touch. There is no evidence for the excretion of CaCO3 by cells other than trichomhydathodes.
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Puff, C. Über die Kalkausscheidungen beiMonophyllaea horsfieldii (Gesneriaceae) . Pl Syst Evol 124, 157–160 (1975). https://doi.org/10.1007/BF00985500
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DOI: https://doi.org/10.1007/BF00985500