Stomatotypes and substomatotypes of Holcoglossum, its relatives and outgroup under LM.

Ad/Ab, adaxial epidermis/abaxial epidermis; tetra, para, latero and polar, represent tetracytic, paracytic, laterocytic and polarcytic respectively; para 1+2 indicates the distribution of the subsidiary cells (in this case, 3 subsidiary cells with1 on one lateral side of the stoma and 2 on the other side); latero 1+2 (same meaning as para 1+2); polar 5(1+2) indicates the distribution of the subsidiary cells (in this case, 5 subsidiary cells with 2 polar not inlcluded in the name of type and 3 lateral,1+2 represents 3 lateral with same meaning as para 1+2); -, no data analysis. Each species is represented in Figure 1.