Fern Sori

F, Polypodiaceae: Portion of a leaf-segment of Microsorum diversifolium with superficial sori and complex anastomosing veins. G, Davalliaceae: Portion of a pinnule of Davallia pyxidata with marginal sori and cupuliform indusia. H, Davalliaceae: Pinnule of Rumohra adiantiformis with superficial sori, peltate indusia and free veins. I, Thelypteridacea: Portion of a pinna of Christella sp. with excurrent veins between the segments. J, Blechnacea: Portion of a leaf-segment of Doodia aspera with superficial sori attached on the inner side of veinlets which are parallel to the costa.