Dennstaedtiaceae

Sori linear, marginal. Rhizome clothed with simple or pleuricellular hairs Dennstaedtiaceae

Sori linear, ± continuous and elongated in a marginal line. False indusium consisting of the recurved margin of the lamina, with or without a thin, inner true indusium which faces the costa

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Veins free below the sori. Indusium 2-valved; the outer false indusium coriaceous; the inner true indusium thin. Rhizome clothed with simple hairs. Stipule-like pinnules absent at the base of the primary pinnae. Pteridium

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Veins anastomising below the sori (Fig. 15). Indusium 1-valved; the false indusium scarious, consisting of the recurved margin of the lamina; the inner true indusium absent. Rhizome clothed with scales and/or pleuricellular hairs which are narrowed at the base. and Stipule-like pinnules present at the base of the primary pinnae Histiopteris