The Epiphytic Fern Elaphoglossum luridum (Fée) Christ. (Dryopteridaceae) from Central and South America: Morphological and Physiological Responses to Water Stress

Figure 2

Cross-sections of Elaphoglossum luridum frond in LM. (a) Mesophyll consists of parenchyma tending to palisade (pp), spongy parenchyma (sp), and uniseriate epidermis, on both sides of the frond. (b) Details of the abaxial tissues showing pits in the spongy mesophyll cell walls. (c) Details of the cuticle showing a light positive Sudan IV reaction. (d) Details of stomata on the abaxial surface. (e) Details of the vascular tissue. Ab: abaxial epidermis, ad: adaxial epidermis, ct: cuticle, en: endodermis, ep: epidermis, p: pit, pp: palisade parenchyma, sp: spongy parenchyma, and st: stomata.