Abstract: Observed under LM in the present work were epidermal cells and stomatal apparatuses of mature leaves in 37 species (50 samples) belonging to 19 genera and 6 subfamilies (Hamamelidaceae), of which 35 species (19 genera, 6 subfamilies) were also used for observing under SEM cuticular membrane and wax sculpture, shape of stomata and stucture of stomatal apparatuses of the lower epidermis. (1) It is found that in the family cells of both upper and lower epidermis are tetragonal, pentagonal and hexagonal or irregular; anticlinal walls are straight, arched, sinuolate and sinuate; stomatal apparatuses, which occur only on the lower surface, may be cyclocytic, stephanocytic, paracytic and anomocytic. All these characters of the leaf epidermis are of systematic significance in the family (Fig. 1). (2) Types of stomatal apparatuses are correlated to a certain extent with the pattern of anticlinal walls of epidermal cells and other external morphological characters. In the majority of cases, the groups, whose stomatal apparatuses are cyclocytic (Exbucklandioideae and Rhodoleioideae) and stephanocytic (Mytilaria Lec. and Tetrathyrium Benth.), all have straight or arched anticlinal walls of lower and upper epidermal cells (except for Exbucklandia tonkinensis with sinuate anticlinal walls of both upper and lower epidermal cells, and E. longipetala with sinuate anticlinal walls of upper epidermal cells) (Plate 1:12, 13; 2:4), are all evergreen trees or shrubs, and all have palmate veins and simple hairs (but Rhodoleioideae is pinnateveined or obscurely trinervious and has tufted hairs), indefinite floral parts and numerous ovules, while the groups, whose stomatal apparatuses are paracytic (Disanthoideae, Chunia H. T. Chang, Liquidambaroideae and Hamamelidoideae, which also has anomocytic type in small portion of species) (Table 2), have sinuolate or sinuate anticlinal walls of upper and lower epidermal cells (except for Chunia, Tetrathyrium, Corylopsis brevistyla and C. willmotiae, which have straight and arched anticlinal walls), are mostly deciduous trees and shrubs, and have pinnate veins and tufted hairs in most species, usually tetra-, or pentamerous flowers (except for Liquidambaroideae, which has indefinite floral parts) and usually single ovule (but Disanthoideae and Liquidambaroideae have numerous ovules). (3) The subfamily Liquidambaroideae possesses polyporate pollen grains (Chang 1958, 1979), a circular vascular system in the midrib, at the centre of which is situated a secretory channel (Huang 1982, 1986) and leaf teeth of the unique Altingioid tooth type (Li 1988) etc. Based on these characters some authors tend to support the separation of the subfamily as a family, Altingiaceae. The subfamily, however, shows strong differentiation of characters. For example, in the subfamily, there are both evergreen and deciduous trees, palmate and pinnate leaf veins, capitate, short-spicate and racemose inflorescences and half-interior and inferior ovaries. Furthermore, some characters in the subfamily, which are considered important for the separation, are crisscross with those ih the other members of the Hamamelidaceae. Their stomatal apparatuses are similar to those in most groups of Hamamelidaceae (paracytic), and Sycopsis sinensis also possesses polyporate pollen grains. The subfamily shares with the remaining members of Hamamelidaceae many important characters, such as the presence of stipule, two styles, 2-locular ovary, axial placenta, capsule. From the data available the separation of the subfamily does not seem to be supported by adequate evidence, and it may well be a link of the Hamamelidaceae with the related families. (4) Considering the fact that the subfamily Disanthoideae and most members of the subfamily Hamamelidoideae are of paracytic stomatal apparatuses and pentamerous flowers, the present authors tend to agree with Huang's (1986) view that the subfamily Disanthoideae is more closely related than the other subfamilies to Hamamelidoideae. (5) Leaf epidermis of the family under study shows great diversity under SEM, even within a genus in some cases, but it is generally stable at subfamily or genus level, and therefore SEM characters of the leaf epidermis is of certain taxonomic significance. For example, Exbucklandioideae possesses ovate stomata. The cuticular membrane is annular around stomata (Plate 3:3-6); most stomata are covered with lump-like cuticular membranes in Rhodoleioideae (Plate 3:7,8,11,12); in Mytilaria the cuticular membrane appears lump-like, with a minute-scaly waxy ornamentation (Plate 3:9); the cuticular membrane is striate, with large scales on it in Chunia (Plate 3:10), and it is vermicular in Sycopsis (Plate 5: 9-11). Some differences were also found among species in a genus, for instance, among the three species inCorylopsis (Plate 4:12-14 and Table 2). Decontaminated thianthrene disproportion. Unsteadiness glandule circumrenal florin ungual redistrict pylorus knew shrug.
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Key words: Hamamelidaceae, Leaf epidermis, Stomatal apparatuses