How to Cite

Adams, W. W., & Martin, C. E. (1986). HETEROPHYLLY AND ITS RELEVANCE TO EVOLUTION WITHIN THE TILLANDSIOIDEAE. Selbyana, 9(1), 121–125. Retrieved from https://journals.flvc.org/selbyana/article/view/120800


For over a century biologists have commented on the heterophyllou's nature ofcertain species in the Tillandsioideae. Juvenile leaves of Til/amisia deppeana Steud. are similar morphologically to those of adult atmospheric tillandsioid epiphytes, while adult leaves resemble leaves of adult tank-forming tillandsioid epiphytes. Although both leaftypes share a common photosynthetic pathway (C3), juvenile leaves maintain positive rates ofnet CO2 exchange during a period ofdesiccation long after CO2 exchange has ceased in adult leaves. Because the juveniles of T. deppeana are more drought-resistant, this life-form was probably a prerequisite to the movement, in an evolutionary sense, ofthe Tillandsioideae into ~e epiphytic habitat. Conjecture regarding the derivation ofmodem tillandsioid epiphytes from xeromorphic or mesomorphic forms must await similar comparative investigations ofjuveniles and adults of other species in this group.


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