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Morphological Changes Accompanying the Transition from Juvenile (Atmospheric) to Adult (Tank) Forms in the Mexican Epiphyte Tillandsia Deppeana (Bromeliaceae)
Adams, William W., III Martin, Craig E.
Adams, William W., III
Martin, Craig E.
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Abstract
Two distinct morphological forms characterize the ontogenetic development of the epiphytic
bromcliad Tillandsia deppeana. Juveniles are characterized by a non-impounding rosette of
small, linear leaves covered with elaborate trichomes possessing a 4 + 8 + 16 + 64 shield cell
pattern. The broader transitional leaves, which form an impounding rosette prior to the initiation
of true adult leaves, also possess trichomes with the 4 + 8 + 16 + 64 cell pattern. Adult
individuals have large, broad leaves with overlapping, sheathing bases which impound water
and debris. These leaves have trichomes with shields exhibiting a 4 + 8 + 32 cell pattern.
Trichome density is fairly uniform in the juvenile leaves with trichomes covering 100% of leaf
surfaces, whereas in the adult leaves density is high at the base and diminishes significantly
toward the apex. Stomatal density of both juvenile and adult leaves increases from the base to
the apex, although this is most pronounced in the adults. Stomata in the adults are also arranged
in longitudinal series parallel and abaxial to parallel rows of mesophyll tissue. The results of
this study indicate that juveniles of 7". deppeana are more similar morphologically to adult
atmospheric-type tillandsioid species than to the tank-forming adults into which they eventually
develop.
Description
This is the publisher's official version, also available at: http://www.jstor.org/stable/10.2307/2443800.
Date
1986
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Botanical Society of America
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Citation
Adams, W.W., III and C.E. Martin. 1986. Morphological changes accompanying the transition from juvenile (atmospheric) to adult (tank) forms in the Mexican epiphyte Tillandsia deppeana (Bromeliaceae). Amer. J. Bot. 73: 1207-1214.