Difference between revisions of "Botrychium subg. Osmundopteris"
Mem. Torrey Bot. Club 19(2): 93. 1938.
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|subgenus=Botrychium subg. Osmundopteris | |subgenus=Botrychium subg. Osmundopteris | ||
Latest revision as of 20:21, 5 November 2020
Roots 15 or fewer, yellow to brown, 0.5–2 mm diam. 1cm from base. Plants over 12 cm. Common stalk lacking idioblasts (elongate, spindle-shaped cells in vascular strand). Trophophore sessile and erect, arising from middle to distal portion of common stalk well above ground level; blade usually 1 per plant, seasonal, absent during winter, deltate, 3–4-pinnate, 5–25 cm wide when mature, thin, herbaceous. Leaf primordia densely hairy, hairs 1.5–2mm. Leaf sheath open. Pinna divisions reduced in size to tip. First pinnule on basal pinnae usually borne acroscopically. Sporophores long-stalked, arising from middle to distal portion of common stalk well above ground level, commonly absent due to abortion in early development or seasonal, stalks only slightly flattened, not fleshy, 0.5–0.8mm wide. x =92.
Discussion
Species 2–3 (1 in the flora).
Selected References
None.