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FNA | Family List | FNA Vol. 2 | Ophioglossaceae | Botrychium

1b. Botrychium Subg. Sceptridium Sect. Hiemobotrychium W. H. Wagner, Novon. 2: 267. 1992.

Roots 20--30, yellow to brown, 0.6--1 mm diam. 1cm from base. Plants over 6 cm. Common stalk with tracheidal idioblasts. Trophophore short-stalked and prostrate, arising from basal portion of common stalk near ground level; blades usually 2 per plant, appearing in late fall and dying in early spring, deltate, 2--3-pinnate, mostly 5--8 cm wide when mature, herbaceous. Leaf primordia with scattered hairs, hairs 0.6--1 mm. Leaf sheath closed. Pinna divisions reduced to tip. First pinnule on basal pinnae usually borne basiscopically. Sporophores long-stalked, arising from basal portion of common stalk near ground level, commonly absent without primordia; stalks and rachis broadly flattened, fleshy, to 1.4 mm wide. x =45.

Species 1: endemic to se United States.

Tracheidal idioblasts in Botrychium sect. Hiemobotrychium are enormous, elongate, spindle-shaped cells with helical or annular thickenings and are scattered along the vascular strand. They are unique among ferns.


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