Biology 337: Glossary ( Glossary | Divisions )
Taken Spring 2005, with Dr. Plant. Information here is based primarily upon notes from class but some from external sources like the web.

annulus unevenly thickened cells found in spore case of ferns
antheridium male gametangium (produces sperm)
archegonia female gametangia
archegoniophore contains archegonia
archegonium female gametangium
bark all tissues that lie outside the vascular cambium. Consists of: primary and secondary phloem, cortex parenchyma + resin canals and the periderm(s)
calyptra enlarged archegonium that surrounds embryo
circinate vernation tight coiled leaf in a young fern
collenchyma cells that are living at maturity and have irregularly thickened walls. provide mechanical support
cotyledons seed leaves
dictyostele a siphonostele that has broken up due to crowing of leaves and leaf gaps
dioecious plant has male and female forms.
eusporangiate have sporangial that arise from several cells, contain a
exarch the order of maturation of xylem. In this case primary xylem, proxylem is formed at the outside and secondary xylem metaxylem is formed in the center
excurrant a plant with a dominant trunk and whorled branches
fascicles needs in a group. Pines are the only ones to possess these
gametangium structure that produce gametes
gametophore fertile stalk that bears gametangia
gymnosperms "naked seed"
heterosporous plant produces two types of spore. Megaspore and microspore. graphic (you'll need to scroll down a bit)
homosporous plant produces one type of spore. graphic (you'll need to scroll down a bit)
hypocotyl stem like region that connects the coltyledons to roots
hypodermis found in coniferophyta. thick-walled again and fibrous tissues reinforce. this layer prevents water loss
indusium an outgrowth from the leaf, evolved to protect the sori
leptosporangiate ferns that arise from a single cell, contain a stalk and a single cell layer wall, have a wall that is modified for spore discharge, are small and contain few spores. It is an evolutionary advancement.
megasporangium structure that produces megaspores
meristeles where a siphonostele has been broken up into smaller vascular bundles
mesophyll photosynthetic tissue in a leaf found between upper and lower epidermis
microsporangium structure that produces microspores
nucellus found in gymnosperms, equivalent to the megasporangium
paraphyses a sterile tissue on moss gametangia that allow for the retention of moisture
parenchyma cells that are the most abundant in plants. totipotent cells
pericycle the outer boundary of the stele found just inside the endodermis
periderm a protective tissue produced by the cork cambium
prophylls enations or scale leaves. scale like structures on stem that lack vascular supply
prothallus heart-shaped, green, and free-living gametophyte of ferns
protonema moss sporophyte. algae-like strands that contain numerous chloroplasts
protostele a solid core of conducting tissues where phloem surrounds xylem. Protostele plants lack a central pith
protoxylem first formed xylem cells
rachis central stalk in fern megaphyll
rhizome an underground stem
sclerenchyma dead or alive, very ridged, thick and often ligninified cell walls. there are two types, sclerids (stone cells, like in pear) and fibres (like in celery).
seta stalk
siphonostele where tissue surrounding the pith is a cylinder. found in ferns
sori clusters of spore cases found on the underside of fern leaves
sporangia stucture which contains spores
sporangiophore structure on a stalk with sporangia
sporocarp specialized fruiting body found in aquatic ferns (looks cool, like a seed that has a tongue)
stele centeral cylinder of tissue lyinginside the cortex. Includes xylem, phloem, pericycle and pith (if present)
stipe (aka: rachis, petiole) stalk in a leaf
trabeculae supports vascular cylinder in airspace of selaginella
xylem vascular tissue that conducts water

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