FIG. 4 in An update of the revision of Cyathea subgen. Alsophila sect. Gymnosphaera (Cyatheaceae) in Madagascar and the Comoros including a discussion of putative hybridization events

FIG. 4. — Cyathea impolita Rakotondr. & Janssen: A, petiole; B, imbricate arrangement of scales at the base of the petiole; C, D, morphology of scales at the base of the petiole; E, two fertile pinnules with a fragment of the costa; F, bullate scales on the abaxial face of the middle vein of a pinnule segment; G, pinnule of a sterile pinna at the base of the lamina with a fragment of the costa; H, abaxial face of a costa fragment; I, adaxial face of a costa fragment; J, sporangia and paraphyses. A-F, Janssen et al. 2602; G, Janssen et al. 2592; H-J, Janssen et al. 2602. Scale bars: A, E, 20 mm; C, D, G, I, 2 mm; F, 0.5 mm; H, 1 mm; J, 0.3 mm.