cataphyll


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cataphyll

a simplified leaf form, e.g. a bud scale, cotyledon, scale leaf.
References in periodicals archive ?
9), lack the distal lamina differentiation suggesting a truncation in distal identity due to the lack or premature cessation of cell division and/or the lack or down-regulation of distal identity gene homologs (potentially ARP orthologs) during cataphyll growth.
Cataphyll single; basal part naked and smooth; distal
These features are associated with almost constant features such as a single cataphyll, coleoptile present or absent, entire eophyll, reduced axis, parallel or palmate venation, induplicate plication, epidermal cells rectangular or sometimes rhombohedral, major veins associated or not associated with ridges, phloem strands 1-3, and metaxylem vessels 1-2.
Cataphylls triangular basally, lanceolate apically, 3-6 cm
Examples of such structural synapomorphies for the extant Cycadales are girdling leaf traces, an inverted omega pattern of vascular bundle arrangement in petiole and cataphyll bases, protoxylem poles changing from endarch in the stem to exarch in the leaf traces, a primary thickening meristem, a contractile taproot, and ageotropic, coralloid, lateral roots (Stevenson, 1990b; Norstog & Nicholls, 1998).
A cycad stem generally consists of a large, starch-rich pith in the centre (with numerous medullary rays, and no growth rings), surrounded by a narrow zone of vascular tissue, followed by a thick layer of cortex, and an outer layer of leaf bases and the remains of dead cataphylls (Chamberlain, 1919; Jones, 1993; Norstog and Nicholls, 1997; Grobbelaar, 2004; Vorster, 2004).
Bulb subglobose to ovoid, slightly compressed, 12-20 x 10-20 mm, prolonged in a collar up to 3 cm, sheathing the underground stem; cataphylls dark-brown, broadly ovate, apex truncate or acute.
The results presented in this work indicate that the seedling and/or tirodendro is cryptocotylar and hypogeal, has cataphylls, and presents eophylls and metaphylls simple with venation pinnate craspedodromous simple.
leyboldii was cryptocotylar and hypogeal, and the embryo had opposite cataphylls.
regularly branched trichomes, leaves and cataphylls withvestigial stipules (at least as seedlings), peltate megasporophylls without spine- or horn-like projections and foveolate pollen (Stevenson 1992, Jones 2002).
The plant grows to a height of 20-30 cm (8-12 in), and sprouts 5-11 white and non-photosynthetic leaf known as cataphylls.