Ecological Comparison of Leaf Structures of Rhododendron punctatum Andr. And the Ontogony of the Epidermal Scales

Leaf Characteristics and Chlorophyll in Relation to Exposure and Production in Rhododendron Maximum

“…Differences are most conspicuous in current leaves; they are less evident, but apparent in averages though not in comparisons of individual shrubs, in older leaves. Differences in microscopic structure of heath leaves with exposure in the Smokies have been described by Cain & Miller (1933) and Duncan (1933).…”

Structure and development of stellate trichomes in Andradea floribunda Fr. Allem. (Nyctaginaceae)

“…It was seen that the trichomes on the adaxial surface of A.Joribunda leaves develop by successive divisions, the first one being oblique or periclinal, following the pattern already described by Uphof (1962). They each originate from only one protodermal cell, as also described by Duncan (1933), Bruni & Modenesi ( 1983) and Fotedar ( 1986) in species of different families.…”

Leaf and twig anatomy of the Pterostemonaceae (Engl.) Small: ecological and systematic features

“…Unfortunately, no field observations or experimental work have been done on this genus. The anatomy of the peltate scales illustrated by Duncan (1933, Fig. 7) and some of those illustrated by Cowan (1950;Plate 13a) and also Metcalfe and Chalk (1950;Figs 191m, n) for R. malayanurn Jack are very similar to those of Pterostemon, but not quite identical.…”

“…Another possibility is that the peltate glands, once they have secreted lacquer on to the leaf surface, are able to absorb water through the 3-5 empty cells in the centre of the outer layer underneath the loose or broken cuticle (see p. 116). Duncan (1933) that the peltate scales of Rhododendron punctatum Andr. were capable of absorbing water.…”

“…O n living material of Escallonia the peltate glands clearly show a secretion on and around them, and the leaf surface also has a glossy appearance as have the leaves of Pterostemon, particularly the adaxial surface. The morphology and anatomy of the peltate glands of Pterostemon most closely resemble those of stem glands of Escallonia viscosa Forbes (Thouvenin, 1890)) and on the leaves of two species of Quintinia (Saxifragaceae s.l., Escallonioideae; Al-Shammary & Gornall, 1994), as well as those on the leaves of some species of Rhododendron (Duncan, 1933;Metcalfe & Chalk, 1950;Theobald, Krahulik & Rollins, 1979). I n addition, the leaves of several species of Escallonia have darkly staining contents in some of the palisade cells as in Pterostemon, and there are also similar secretory cells in the stem cortex, pith, phloem and medullary rays in both Escallonia and Pterostemon.…”