Ophioglossaceae

Sporangia embedded in 2 rows in a simple spike or panicle borne on a fleshy glabrous stalk attached at or near the base of a sterile frond. Vernation straight or inclined. Terrestrial or rarely epiphytic plants with fleshy roots Ophioglossaceae

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Veins of the lamina free, dichotomous. Fertile spikes 1–3-pinnate; the sporangia distinct. Sterile lamina 1-pinnate to 3-pinnate-pinnatifid Botrychium

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Veins of the lamina anastomosing, with or without free vein-endings in the areolae. Fertile spikes simple; the sporangia coalescing. Sterile lamina simple or irregularly forked near the apex Ophioglossum