Thelypteridaceae – Marsh Fern Family

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THELYPTERIDACEAE – MARSH FERN FAMILY Plant: fern, terrestrial (rarely epiphytic) Root: Stem and Leaves: stems erect to creeping, usually with 2 vascular bundles, cresent-shaped; leaves either monomorphic (one leaf type) or slightly dimorphic (blade differences minor), scales mostly absent, blade pinnate to pinnate-pinnatifid (rarely by-pinnate or more divided) Fruit (Sori): sori on veins and of various shapes but usually not elongate, an indusium often with hairs, spores monolete, bilateral Other: Division Pteridophyta (Ferns) Genera: 30+ genera * Fern terminology is discussed in PLANT TERMS, a separate tab on the HOME page. WARNING – family descriptions are only a layman’s guide and should not be used as definitive THELYPTERIDACEAE – MARSH FERN FAMILY Eastern Marsh Fern; Thelypteris palustris Schott var. pubescens (G. Lawson) Fernald Eastern Marsh Fern - P1 USDA Thelypteris palustris Schott var. pubescens (G. Lawson) Fernald Thelypteridaceae (Marsh Fern Family) Near Mingo National Wildlife Refuge, Stoddard County, Missouri Notes: fern, deciduous; leaves somewhat dimorphic (pinnae of fertile leaves somewhat narrower, more erect), up to 1m, lanceolate with proximal pinnae a little shorter, mostly pinnate-pinnatifid, terminal pinnae just pinnatifid, pinnatifid segments of pinnae entire, veins usually forked, hairs on costae and often on veins; petiole smooth and straw colored; spore cases round, medial; indusia peltate to reniform (sometimes leaf blade strongly revolute); costae slightly hairy and scaly with a front groove; seeps and marshy areas; summer to fall [V Max Brown, 2017] Eastern Marsh Fern – P2 Thelypteris palustris Schott var. pubescens (G. Lawson) Fernald [V Max Brown, 2017] Sporangia Indusia Costae (midrib), veins, and sori with hairs.

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