WebMost ferns have divided fronds. These may be once-cut (pinnate), twice cut (bipinnate), three times cut (tripinnate and so on. The terminology used is as follows: stipe - the stalk or base of the frond rachis - the continuation of … WebJan 17, 2024 · In some squid species, the pen rachis flares out into wings on either side, and the tip of the rachis grows into a thick cone. (ornithology) The central shaft of a feather. [from 19th c.] The main shaft of either a compound leaf, head of grain, or fern frond. [from 19th c.] Usage notes . The plural form rachides is based on a mistaken ...
Fern rachis transverse section, light micrograph - Stock Image
In plants, a rachis is the main axis of a compound structure. It can be the main stem of a compound leaf, such as in Acacia or ferns, or the main, flower-bearing portion of an inflorescence above a supporting peduncle. Where it subdivides into further branches, these are known as rachillae (singular rachilla). A ripe … See more In biology, a rachis /ˈreɪkɪs/ (from the Ancient Greek: ῥάχις [rhákhis], "backbone, spine") is a main axis or "shaft". See more In vertebrates, rachis can refer to the series of articulated vertebrae, which encase the spinal cord. In this case the rachis usually … See more • Stipe (botany) See more WebA fern frond that is three times divided. First the pinnae are separated from each other down to the rachis and then each pinnae has pinnules that are divided down to the costa of the pinnae and then each pinnuule is divided along its central vein (costule) into separate divisions that cut down to the vein. otava low profile platform bed
Beech Fern (Phegopteris hexagonoptera) - Illinois Wildflowers
Webpetiole and rachis were used by Native Americans for weaving baskets. quillwort. corms were once eaten by humans, as well as domestic and wild animals and waterfowl. sword … WebFind many great new & used options and get the best deals for Carboniferous Plant Fossil Seed Fern Rachis at the best online prices at eBay! Free shipping for many products! WebCyrtomium fortunei var fortunei has twelve to twenty-six pairs of pinnae which are limited to twelve in var. clivicola. The pinnae are much larger, more lance-shaped and rounded at the base. The fronds of the type … otava westland