pinnatifid


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pinnatifid

(of leaves) having a LAMINA cut into lobes that reach about halfway towards the midrib.
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Rhizomes long, creeping; fronds monomorphic or dimorphic; blades pinnatifid to bibinnate; sori mostly abaxial, medial to marginal; sproangia stalked; spores oblong or reniform.
Agardh's order Fucoidae, and contains 62 species partitioned into seven unnamed groups recognizable by the following morphological characters: (i) axillary receptacles and whole leaves; (ii) axillary receptacles and pinnatifid leaves; (iii) vesicules and leaves of small size (Microphylla); (iv) terminal receptacles; (v) leafy vesicles, and spatulate and inflated leaves; (vi) axes flattened, pinnatifid and foliar, and axillary vesicles and receptacles; (vii) leaves without midribs, receptacles marginal and fixed to leaves, and solitary capsules in each tubercule.
Middle and upper cauline leaves pinnatifid or pinnatisect, rarely laciniate, with 3-6(-8) lobes on each side L.
Leaves strongly dimorphic; sterile leaf blades pinnatifid and net veined, fertile leaf blades 2-pinnate and forming a bead-like cluster .
Leaves rosulate; pseudopetiolate; blades elliptic to ovate, pinnately veined, margin entire to lyrate or pinnatifid, glabrous to pubescent.
Rachis straw-colored to greenish; leaves palmately compound or pinnatifid (both leaf types often present on same plant); terminal leaflets from 4-13 cm long: Pteris
Basal leaves 10-15 (-25) cm long; laminas narrowly ovate, 70 x 30 to 150 x 45 (to 200 x 60) mm, pinnatisect (lower lobes generally free) with (6-) 9-12 (-14) lobes on each side; lobes narrowly ovate, up to 30 x 20 mm; lobe margins grossly serrate to pinnatifid to lobulate, with 5-8 serrations or lobules on each side; lobules up to 8 mm long, distal lobules usually recurved; adaxial leaf surface sparsely setose with stinging hairs 3-5 mm long and covered with scabrid trichomes up to 1 mm long; abaxial surface setose, very densely set with scabrid (up to 1 mm long) and glochidiate trichomes (up to 0.
Sessile, cauline leaves (sometimes improperly called "ligules" on Gunnera): (0) absent; (1) like other leaves, but smaller and sessile; (2) small, straplike; (3) small, shieldlike; (4) budlike; (5) pinnatifid to laciniate.