spore tetrads

Listing 1 - 8 from 8 for spore tetrads

Generalized life cycle of Equisetum
... scale are sporangia (2) containing homosporous spores. The spores go through meiosis and produced spore tetrads (3). The spore tetrads mature with attached elater tissue necessary to keep the spores air borne Return to ...
home.manhattan.edu

Bryophyta
... the gametophyte. The embryo grows & forms a mature sporophyte, within which sporogenous tissue will form spore tetrads, which in turn are released as the spores, forming either the gametophyte, or the protonema ... the capsule as the calyptra. Sporogenous tissue forms around the columella, and spore mother cells undergo meiosis to form tetrads of haploid spores. At the top of the capsule is the cap ...
www.cs.cuc.edu

Lab IV - Early Land Plants (Range Chart)
... that are unlikely to preserve in the fossil record, although some have suggested that early spore tetrads may represent liverworts (hence the question mark associated with this group's range). Taxa in ...
www.ucmp.berkeley.edu

Rhynie IV
... OF GENERATIONS IN EARLY LAND PLANTS Aglaophyton major and Lyonophyton rhyniensis Germinating spore Spore tetrads in sporangium Male gametophyte with antheridia Archegonium longitudinal view Above: Antheridium with ... the rather simple gametophytes described as Lyonophyton and Remyophyton. Germinating Horneophyton spore Kidstonophyton discoides Thanks to the discovery of germinating spores in various ...
www.uni-muenster.de

Spores of Horneophyton
Spores of Horneophyton Back Horneophyton lignieri: Spores Spore tetrads of Horneophyton. Groningen. HS. Click at the photo to see more detail. Spore tetrad of Horneophyton. Diameter of the tetrad 50 µms. Back Top
www.xs4all.nl/~steurh

Glossary of Pollen and Spore Terminology - New terms
... tetragonal tetrads or Y-shaped from tetrahedral tetrads. Examples: Nypa fruticans, Howea belmooreana (Palmae). Inner tetrad mark (Gupta and Udar, 1986) A tetrad mark at the inner layer of a spore ... (pl. quasisacci, adj. quasisaccate) (Meyen, 1988) Synonym of protosaccus. Quasitectate (adj.) (Balme, 1988) A spore exine in which the outer and inner, more or less homogeneous, layers aer seperated ...
www.biol.ruu.nl

Glossary of Pollen and Spore Terminology - Part 2 (D-H)
... spores are shed, which may range from individuals (monads), to pairs (dyads), groups of four (tetrads), or groups of more than four (polyads). Larger, indeterminate numbers of pollen grains or spores ... a spore consisting of a sharply tapering spine and a broad bulbous base. Garside's law/rule (Garside, 1946; Erdtman, 1952) The name given to an unusual arrangement in developmental tetrads of ...
www.biol.ruu.nl More from this site

The oldest land plants (2)
... clusters of four. For some time these often cluster in so called tetrads. Click the photo to see one. One spore has a diameter of about 50 µms. The Rhynie Chert is ...
www.xs4all.nl/~steurh