Among the interesting features of Bryophyllum calycinum Salisb. is the occurrence of foliar embryos in the notches of the leaf (Fig. 3) which under favorable conditions will give rise to new plants. In the apices of the crenations are hydathodes (Fig. 3) whose structure has been described by Berge (1877) and Yarbrough (1932, 1934). A hydathode typically occurs at a vein ending in a leaf margin, but in Bryophyllum calycinum the hydathode consists of a vascular plexus surrounding an epithem which is associated with a special group of stomata on the lower side of the leaf. The cells of the epithem superficially resemble those of the foliar embryos in that they are of approximately the same size and shape and have conspicuous nuclei and dense cytoplasm.
Proceedings of the Iowa Academy of Science
©1942 Iowa Academy of Science, Inc.
Craft, James H.
"Extra-Floral Nectaries in Bryophyllum calycinum,"
Proceedings of the Iowa Academy of Science, 49(1), 113-115.
Available at: https://scholarworks.uni.edu/pias/vol49/iss1/10