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In biology, a theca (pl.: thecae) is a sheath or a covering. In botany, the theca is related to plant's flower anatomy. The theca of an angiosperm consists...

composed of two overlapping sections known as thecae (or less formally as valves). The joint between the two thecae is supported by bands of silica (girdle...

of an anther, made up of four pollen sacs arranged in two sheaths called thecae, connected to a filament, or stalk. The anther contains microspores which...

Internal Adnexa Ovaries Follicles Corpus Hemorrhagicum Luteum Albicans Thecae Externa Interna Follicular antrum Follicular fluid Corona radiata Zona pellucida...

certain species with hooked thecae. True Monograptus have straight tubaria that may be curved dorsally near the sicula. The thecae are distinctly hooked, with...

Theca interna Details Identifiers Latin tunica interna thecae folliculi FMA 18658 Anatomical terminology [edit on Wikidata]...

remains from the Eocene of Barbados can be interpreted as dinoflagellate thecae of the dinoflagellate genera Lithoperidinium, Jusella, Sieblosphera and...

Internal Adnexa Ovaries Follicles Corpus Hemorrhagicum Luteum Albicans Thecae Externa Interna Follicular antrum Follicular fluid Corona radiata Zona pellucida...

Monograptids have only one row of thecae per stipe (stem, branch), unlike the biserial graptolites which have two opposing rows of thecae per stipe. List of genera...

Internal Adnexa Ovaries Follicles Corpus Hemorrhagicum Luteum Albicans Thecae Externa Interna Follicular antrum Follicular fluid Corona radiata Zona pellucida...

sections, sect. Monolobos and sect. Dilobos DC., based on the number of thecae on the anthers. Sect. Monolobos has 18 species and is found primarily in...

understood to be an acanthograptid with a unique style of 'thecal bridges' where thecae from one stipe cross over to adjacent stipes. Dictyonema is a genus of callograptid...

Internal Adnexa Ovaries Follicles Corpus Hemorrhagicum Luteum Albicans Thecae Externa Interna Follicular antrum Follicular fluid Corona radiata Zona pellucida...

Internal Adnexa Ovaries Follicles Corpus Hemorrhagicum Luteum Albicans Thecae Externa Interna Follicular antrum Follicular fluid Corona radiata Zona pellucida...

typical four found in other members of the tribe Mentheae) and the two thecae on each stamen are separated by an elongate connective which enables the...

1-locular and with many ovules. Stamens consist of short filaments with thecae at the tip, dehiscing by a pore. Pollens squeezed out from the theca pore...

substances on a rigid silica framework, and composed of two halves called thecae (or less formally, valves). These halves overlap like a Petri dish and its...

composition has been very fluid. Some Rhizaria possess mineral exoskeletons (thecae or loricas), which are in different clades within Rhizaria made out of opal...

Internal Adnexa Ovaries Follicles Corpus Hemorrhagicum Luteum Albicans Thecae Externa Interna Follicular antrum Follicular fluid Corona radiata Zona pellucida...

Internal Adnexa Ovaries Follicles Corpus Hemorrhagicum Luteum Albicans Thecae Externa Interna Follicular antrum Follicular fluid Corona radiata Zona pellucida...

unique silica cell wall known as a frustule made up of two valves called thecae, that typically overlap one another. The biogenic silica composing the cell...

nonreproductive) tissue of the anther between and interconnecting the two thecae, which forms a body with them and holds them together. It is usually underdeveloped...

Theca externa Details Identifiers Latin tunica externa thecae folliculi FMA 18657 Anatomical terminology [edit on Wikidata]...

Corolla tubular, yellow or magenta with yellow throat. Stamens didynamous; Thecae divaricate; Staminode reduced. Ovary conical to linear, bilocular. Ovules...

Internal Adnexa Ovaries Follicles Corpus Hemorrhagicum Luteum Albicans Thecae Externa Interna Follicular antrum Follicular fluid Corona radiata Zona pellucida...

Internal Adnexa Ovaries Follicles Corpus Hemorrhagicum Luteum Albicans Thecae Externa Interna Follicular antrum Follicular fluid Corona radiata Zona pellucida...

Internal Adnexa Ovaries Follicles Corpus Hemorrhagicum Luteum Albicans Thecae Externa Interna Follicular antrum Follicular fluid Corona radiata Zona pellucida...

Internal Adnexa Ovaries Follicles Corpus Hemorrhagicum Luteum Albicans Thecae Externa Interna Follicular antrum Follicular fluid Corona radiata Zona pellucida...

within the genus. Dinophysis thecae are divided into halves by a sagittal fission suture. There are five types of thecae ornamentation in this genus,...

Internal Adnexa Ovaries Follicles Corpus Hemorrhagicum Luteum Albicans Thecae Externa Interna Follicular antrum Follicular fluid Corona radiata Zona pellucida...

Internal Adnexa Ovaries Follicles Corpus Hemorrhagicum Luteum Albicans Thecae Externa Interna Follicular antrum Follicular fluid Corona radiata Zona pellucida...

and anther thecae largely separated, whereas in Haplothismia the 2-6 flowers are borne on pseudoracemes, without annulus, and the anther thecae are connate...

containing the pollen (or thecae) are pale mauve, cream-coloured or yellow. Usually the anthers are oblong to linear with two parallel thecae. In B. melanops,...

Internal Adnexa Ovaries Follicles Corpus Hemorrhagicum Luteum Albicans Thecae Externa Interna Follicular antrum Follicular fluid Corona radiata Zona pellucida...

Internal Adnexa Ovaries Follicles Corpus Hemorrhagicum Luteum Albicans Thecae Externa Interna Follicular antrum Follicular fluid Corona radiata Zona pellucida...

A. Yu.; Vickers-Rich, P.; Zakrevskaya, M. A.; Hall, M. (2019). "Conical Thecae of Precambrian Macroorganisms". Paleontological Journal. 53 (11): 1134–1146...

leathery, margin sharply coarsely-serrate. Stamen baculate to terete; thecae shorter than connective. Stigma subcapitate. Fruit globose or ovoid, 3–4 mm...

Amauriella Rendle. The two genera were distinguished by the position of the thecae on the synandria (fused anthers). The latest taxonomic revision regards...

surmounted by a pollen bearing anther. The anther usually consists of two fused thecae. A theca is two microsporangia. The gynoecium (women's house) is the collective...

with approximately ten cup-like structures (thecae) for every 10 mm (0.39 in) of the stipes. The thecae are tilted at a 45° angle to the axis. Tetragraptus...

glabrous on the outside and white, sometimes with pink or reddish tints. The thecae has two apical spurs, the tubules 1.2 to 1.8 mm. The fruit is spherical...

filaments free or basally connate; anthers with divaricate or pendulous thecae, unilocular, more or less elongated and later becoming vermiform; pollen...

on top, which bears the pollen, commonly consisting of (1) two of four thecae, which contain the pollen and (2) a sterile region in between the connective...

Internal Adnexa Ovaries Follicles Corpus Hemorrhagicum Luteum Albicans Thecae Externa Interna Follicular antrum Follicular fluid Corona radiata Zona pellucida...

is slightly smaller than the epitheca. During asexual reproduction both thecae form the epitheca of the new daughter cell and each daughter produces a...

differences based on the colonies, the hydrotheca and even the pairs of thecae themselves. Air fern (Sertularia argentea), sold dried as novelty "plants"...

Internal Adnexa Ovaries Follicles Corpus Hemorrhagicum Luteum Albicans Thecae Externa Interna Follicular antrum Follicular fluid Corona radiata Zona pellucida...

early development and then smooth, lacking hairs with maturation. Yellowish thecae of anthers. Female flowers are yellow and are at the end of a long, white...

means that cell body and flagellar scale production occurs separately. The thecae of Chlorodendrales species are often unique, and it is an important character...

column. The anthers form a globose head. The pollen is produced in S-shaped thecae. Female flowers have an inferior ovary consisting of three carpels and producing...

flowers, of which the 4 to 6 stamens are fused into synandria, with the thecae on its sides. The lower part of the spadix is covered with female flowers...

Biodiversification Event (GOBE) influenced changes in the morphology of the colonies and thecae, giving rise to new groups like the planktic Graptoloidea. Later, some of...

Vickers-Rich, P.; Zakrevskaya, M. A.; Hall, M. (December 2019). "Conical Thecae of Precambrian Macroorganisms". Paleontological Journal. 53 (11): 1134–1146...

male flowers, of which the 4-6 stamens are fused into synandria, with the thecae on its sides. The lower part of the spadix is covered with female flowers...

also rounded triangular, or clover-leaf shaped in appearance. The overall thecae is usually straight to slightly curved, with smaller phosphatised examples...

corolla, filaments free or connate, anthers strong with strongly granular thecae, tubules nearly as long as anther sacs, or laterally connate or fused to...

of this plant. The anthers consist of a creamy yellow to golden yellow thecae and yellow to yellowish brown tubules. Anther size ranges from 1.5–2 mm...

called thecae, joined by an area called the connective, which is also where the anther joins the filament. It is usually formed by two thecae, but sometimes...

this electron micrograph of a secondary follicle, the oocyte, theca cells (thecae folliculi), and developing antrum are clearly visible. Electron microscopy...

the United States, and Wales. It lived in deep water environments. The thecae possess considerable overlap, and it has isolated metasicula as the main...

Characteristics that this genus shares with Phyllachne include apically fused thecae that form a single-celled curved anther and the epigynous nectaries. Forstera...

instead of the usual 2, has 3 compartments, or "thecae," which split open to release pollen. These thecae fold back on themselves, producing the effect...

anthers are about 0.5 mm (0.020 in) in diameter and have divergent yellow thecae and purplish black connective. The sessile, ovate pistil in 1.3–4 mm (0...

is formed by fused scales; colonial forms have stalks formed from empty thecae. Reproduction occurs asexually; sexual reproduction has not been observed...

male part contains sterile flowers. The anthers of the male spadix has thecae dehiscing by the apical slits. The pale white sigmoid appendix is 20 cm...

only slightly protruding. The anthers consist of two distinct, divaricate thecae that form a ring-like structure. Dehiscence is longitudinal, and the pollen...

thecae joined by a connective bearing osmophores that attract males of Euglossa cordata bees. As they collect fragrances, the bees press the thecae and...

of the tubular nectary in Ruptiliocarpon. The pollen is produced in four thecae on each anther. The stigmas are elongated, appearing as false styles, known...

A.Yu.; Vickers-Rich, P.; Zakrevskaya, M.A.; Hall, M. (2019). "Conical Thecae of Precambrian Macroorganisms" (Free full text). Paleontological Journal...

sides could act as a keel. The inhibition of rotation provided by their thecae would lead to increased water flow over parts of the cell which could enhance...

male flowers, of which the 4-6 stamens are fused into synandria, with the thecae covering the side of the synandrium entirely as well as the larger part...

slits. In Medusagyne and Quiinoideae, an enlarged septum separates the thecae. Staminodes often present, free or connate, sometimes petaloid, sometimes...

which is easily recognised even when poorly preserved by the form of the thecae. Paleontology portal Richard A. Fortey, Yuandong Zhang & Claire Mellish...

Vickers-Rich, P.; Zakrevskaya, M. A.; Hall, M. (December 2019). "Conical Thecae of Precambrian Macroorganisms". Paleontological Journal. 53 (11): 1134–1146...

having bowl-shaped flowers with distinctly concave petals, orange-coloured thecae and longer style. The national flower of Bhutan was thought previously to...

flowers, of which the 4 to 6 stamens are fused into synandria, with the thecae on its sides. The lower part of the spadix is covered with female flowers...

5 mm long, 1.5 mm wide, stamens 6 free, anthers conspicuously extrorse, thecae dehiscing by broad lateral slits, apex almost confluent. Female inflorescences...

with two curved rows of small setae anterior to the spiracle. The wing thecae reach the sixth abdominal segment and have scattered setae on their upper...

semi-endogenous (only the hypovalve of the resting spore enclosed within the parent thecae). The common characteristic of diatom resting spores is a thick silica frustule...

it." Grew further explored this idea and found that stamens with their thecae are male sex organs while pistils represent the female organs. These ideas...

section of the dentary and the strong transverse expansion of the dental thecae, both of which are present in BMNH R14153. Longrich (2016) dubbed the new...

anthers are approximately sagittate (arrowhead-shaped), or heart-shaped. The thecae are elongated. The ovary has 3 or 5 fused carpels, or seed chambers and...

theca has one sporangium, whereas for most angiosperms, there are two. The thecae open by one valve. The ovary is half-inferior and, as in the rest of the...

In ventral view, the head is 1.1 times as wide as long. The mandibular thecae are thick, with no indication of teeth. The pterothecae have a curved costal...

seen. Link thought that microscopic structures known today as basidia were thecae, comparable in form to the asci of the Ascomycetes, and that each theca...

male flowers, of which the 5-6 stamens are fused into synandria, with the thecae on its sides. The lower part of the spadix is covered with female flowers...

apex and not recurving. They sometimes have stiff hairs at tip. The anther thecae is without glands and calcarate at the base (spurred), with narrow tails...

or 1838; the date is uncertain. A first relation between dinoflagellate thecae and cysts was made through morphological comparison of both by Bill Evitt...

deshisce laterally. The thecae extend along nearly the entire length of the stamen. The connective tissue between the thecae can be hairless or covered...

preservation of conodont elements close to the apertures of graptolite thecae might be evidence of a predatory or parasitic relationship between conodonts...

pairs of unequal length. Each stamen has two divergent, oblong and curved thecae. The two-locular ovary has numerous ovules, and produces numerous seeds...

centimeters (0.79–0.98 inches) in width. The stamens are subexserted. The anther thecae are weakly divergent, thick, and measure 5–6 millimeters (0.20–0.24 inches)...

dehiscence is by a longitudinal slit, connective not projecting beyond thecae or only slightly so. The gynoecium is syncarpous. The ovary has two to six...

only of separate stamens with sessile, basifixed anthers. The two truncate thecae each consist of two pollen sacs and open longitudinally by a slit. The head-like...

opens, the stamens begin to elongate. One of them bends inward, opens the thecae of its anther, and dumps its pollen on the ovary. It then bends away from...

the others, and on rRNA trees they are mixed with the species that lack thecae. The other three orders are probably monophyletic, with the Dinophysiales...

extant species are primarily based on the motile stages (namely on the thecae, which are less diverse). This has led to two distinct systematics: paleontological...

frustule forms as different sized valves, which overlap and are called thecae. Chaetoceros pseudocurvisetus can reproduce both asexually and sexually...

or sterile (in R. parviflora). Anthers with filaments hairless or hairy, thecae usually unequal, anthers basifixed, pollen grains free or in tetrads; Nectary...

(covered with small scales) outside. The anthers are glabrous (smooth), the thecae is straight, divaricate (wide spreading). The ovary is linear-cylindric...

with denser pubescence at the junction of the anthers and filaments. The thecae are 5 to 7 millimeters long. The tubules are 10 to 14 millimeters long,...