Rhizomes long creeping, covered with membranous ovate-apiculate scales; rhizome scales comose in distinct grades on dorsal surface, bicolorous with a dark central streak of sclerotic cells and pale margins, which are denticulate to erose; blade lanceolate to oblanceolate, basally pinnatisect and lobed to pinnatifid
distally, with proximal lobe free; laminar scales scattered on abaxial surface and glabrescent on adaxial surface, with round to ovate scales with apiculate or caudate apices, center obscure brown, margins pale brown, fimbriate to ciliate; midribs and secondary veins not visible; sori oblong, with orbicular, peltate scales similar to those in the lamina; spores bilateral, abortive, prominently verrucate.
Lactuca serriola is a roadside weed plant with two or three inches lobed or pinnatifid
leaves that clasp the stem.
5) cm, crowded at base and along stem, oblanceolate, sinuate-dentate or pinnatifid
with acute lobes; lower leaves long-petioled, upper and floral sessile.
Proteaceae also occur in the Paleocene of New Zealand, and include an incomplete but cuticle-bearing pinnatifid
leaf described by Pole (1997) as Lomatia novaezelandiae.
Netted, or pinnatifid
, vein arrangement has a main central midrib with secondary veins branching from it.
Rhizomes long, creeping; fronds 30-130 cm long, monomorphic or dimorphic; blades pinnatifid
, ovate-deltoid to ovate-triangular; sori oblong in chain-like rows.
Such examples include white pine (Pinus strobus--SR), Canada blueberry (Vaccinium myrtilloides--SE), wintergreen (Gaultheria procumbens), rock spikemoss (Selaginella rupestris--ST), pinnatifid
spleenwort (Asplenium pinnatifidum), hay-scented fern (Dennstaedtia punctilobula), northern bush-honeysuckle (Diervilla lonicera--SR), and Forbes' saxifrage (Saxifraga forbesii Vasey--SE).
Figure 11a shows the tip region of a primary or secondary pinna with 2 cm long pinnules homologous to ultimate pinnae, which then change to pinnatifid
pinnules in which subsidiary veins tend to dominate.
The coconut is a palm with a long, flexible, greyish, almost smooth stem, with a tuft of about thirty pinnatifid
leaves 16-20 in (5-6 m) long.