endothecium


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Related to endothecium: amphithecium, stomium, tapetum

endothecium

[‚en·də′thē·shē·əm]
(botany)
The middle of three layers that make up an immature anther; becomes the inner layer of a mature anther.
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The stamens are twice the number of the corolla-lobes and have anthers that are smooth to distinctly papillose, opening with longitudinal slits by means of a fibrous endothecium.
Finally, Ledothamnus and Bryanthus differ from Bejaria in the lack of an endothecium.
Stamens (2-)5-10(-16), free from the corolla or adnate, sometimes connate, included or exserted, the filaments straight to variously curved, unicellular-pubescent or glabrous; anthers tetrasporangiate or bisporangiate, inverting (late, or more commonly early) in development, with 2 or 4 apparently terminal or dorsal appendages (awns, spurs) or these sometimes on the filaments, opening by pores or short to long slits, sometimes through narrowed tubules, an endothecium usually lacking.
Stamens 10, included, the filaments [+ or -] straight, unicellular pubescent; anthers tetrasporangiate, inverted late in development, papillose or smooth, with a pair of awns, with fibrous endothecium, opening with longitudinal slits.
Stamens 10, anthers inverting usually just before anthesis, with or without appendages at the anther-filament junction, endothecium present but sometimes poorly developed.
Stamens 10, the filaments [+ or -] dilated basally, straight, usually smooth; anther dehiscing by terminal pores, inverting just before anthesis, appendages none, surface usually smooth, endothecium present, resorbtion tissue present or absent.
Stamens 10, the filaments not dilated basally, straight, glabrous or with short hairs; anther dehiscing by terminal pores or [+-] elongated slits, inverting just before anthesis, appendages uncommon, small, smooth, paired, at anther--filament junction, or anthers hippocrepiform, dehiscing by slits, appendages none, surfa ce usually smooth, endothecium at most poorly developed, pollen monadinous.
Stamens 10, the filaments not dilated basally, straight, smooth; anther dehiscing by slits widening considerably apically, inverting some time before anthesis, appendages long, strongly papillate, paired, at anther-filament junction, surface papillate, endothecium present, pollen monadinous.
Stamens (8-)l0, included, the filaments [+ or -] strongly dilated basally, [+ or -] straight, unicellular-pubescent or smooth; anthers tetrasporangiate, inverting only just before anthesis, slightly roughened, with a pair of dorso-apical spurs, lacking a fibrous endothecium, lacking disintegration tissue, dehiscing by terminal pores or slitlike pores.
Stamens (8-)10, included, the filaments [+ or -] straight, unicellular-pubescent or smooth; anthers inverting early in development, roughened, with a pair of dorso-apical spurs at (or just above) junction with filament, lacking a fibrous endothecium, with or without a white deposit of disintegration tissue dorsally, dehiscing by terminal, slitlike pores.
In this case, the first wave of starch degradation can be correlated with parallel anther growth, formation of endothecium thickenings, and tapetum development, whereas the second may be due to the arrest of anther growth and a subsequent surplus of soluble sugars from the filament (Clement et a l.
2B, 2D), especially in the epidermis, the endothecium, and the middle layers throughout microsporogenesis (Kirichenko et al.