Taxon: Trichodon muricatus

Plate 18. 1–8, Pringleella sinensis. 1, habit (× 14). 2, upper stem leaf (× 35). 3–5, lower stem leaves (× 35). 6, upper stem leaf apical cells (× 370). 7, basal leaf cells (× 370). 8, lower stem leaf apical cells (× 370). 9–15, Trichodon muricatus. 9, habit (× 10). 10–12, leaves (× 30). 13, apical leaf cells (× 335). 14, median leaf cells (× 335). 15, basal leaf cells (× 335). (1–8, drawn from Handel-Mazzetti 12615, H; 9–15, drawn from C. Gao 2366, IFSBH.)