Table 4.

Effect of ploidy level on characteristics of the stoma of Anoectochilus formosanus.

Characteristics	Ploidy Level
	Diploid	Tetraploid
Stomatal density (no./500 × 500 μm2)	62.6 ± 3.6a *	28.4 ± 3.3b
Stoma length (μm)	24.8 ± 1.4b	30.6 ± 0.6a
Stoma width (μm)	16.8 ± 1.4b	24.6 ± 0.6a
Length/width ratio of stoma	1.48 ± 0.09a	1.23 ± 0.01b
No. of chloroplasts per stoma	24.6 ± 2.0b	57.4 ± 1.7a

* Means ± SD within a row followed by the same letter are not significantly different according to Duncan’s multiple range test (P ≤ 0.05).