pinnule

Rachis winged; pinnules opposite,> 2.5 cm long 11.

12, fig.2) illustrated a pinna fragment with three pinnules clearly showing the venation characteristic of the species.

In addition, stomatal density is low in this taxon since the occurrence of stomata is restricted to the marginal parts of pinnules. However, the above-mentioned features of the stomatal apparatus are not exclusively connected with a vine- to liana-like growth habit but may also occur in non-scrambling/climbing taxa that need special protection from excessive transpiration.

scheuchzeri that undoubtedly has one of the largest "pinnule" structure of arborescent medullosalean plants of the Late Carboniferous Period

Pinnae and pinnules arise as small multicellular mounds that later develop tetrahedral apical cells, which produce segments on three sides.

The pinnules of the specimens recovered are smaller than those described by Harris (1961) from the Yorkshire material.

More than 95% of this plant material comprises remains of medullosan pteridosperms, including trunks [less than or equal to] 95 mm in diameter that show resin rodlets and downward-recurved petioles, large bifurcating petioles [less than or equal to] 56 mm in diameter, and pinnae of Macroneuropteris scheuchzeri with cyclopterid pinnules, and Neuropteris ovata.

Unique Characteristics: Stem is typically black; holds fan-shaped pinnules; also available preserved with glycerine.

Soft corals have closely spaced pinnules, or branches, on their tentacles that make them well suited for capturing phytoplankton, which are smaller than zooplankton, the authors note.

Crinoids can discard and then regenerate various appendages, such as arms, cirri, pinnules (Candia Carnevali, 2006), and the entire calyx and internal organs (Amemiya and Oji, 1992).

Lygodium japonicum is a perennial fern with wiry brown rachis and yellowish green leaflets or pinnules capable of forming thick mats that can shade and eliminate underlying vegetation.

pinnules dichotomously branched, segments 15-22 mm wide; section flat;

5) sparsely branched to third or fourth order, branches arising laterally and at right angles to lower ramifications; stem and branches with four to six longitudinal rows of primary pinnules arranged bisserially and in alternating groups along the length of axis; posterior primaries 2.2-4.6 cm long (colonies average variation about 1.5-3.25 cm); secondary pinnules about 0.68-1.53 cm (colonies average variation), in a single series on basal half of posterior (abpolypar) side of primaries; tertiary pinnules few in number (one to tree) and restricted to posterior side of those secondaries nearest the base of each primary; quaternary pinnules rarely present.

Rhizome elongated (internodes distinct), apex usually protruding more than 1 cm past leaves; pinnules near middle of blade dissected to midrib (pinnate); bulbletsabsent; leaf blades usually widest near middle C.

Leaves glabrous or essentially so; pinnules entire or lobed only at base .......