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A layer of nutritive cells surrounding the spore mother cells in the sporangium in higher plants; it is broken down to provide nourishment for developing spores.
A reflecting layer in the choroid coat behind the neural retina, chiefly in the eyes of nocturnal mammals.
A tract of nerve fibers forming part of the roof of each lateral ventricle in the vertebrate brain.



a layer (occasionally several layers) of cells in the sporangia of the majority of higher plants; it is rich in nutrients and physiologically active substances. The tapetum may originate from the archespore, as in leptosporangiate ferns and selaginellas. It may be the inner layer of the sporangium wall, as in eusporangiate ferns, plants of the order Lycopodiales, and plants of the genus Equisetum, or the inner layer of a microsporangium, as in seed plants.

The substances in tapetum cells are used by the developing sporocytes and spores; in seed plants they are used by the pollen grains as well. The tapetum cells either form a periplasmodium, or amoeboid tapetum, or they maintain their position, forming a secretory tapetum. There is no tapetum in the sporangia of Psilotophyta or Isoëtales.

References in periodicals archive ?
Once the blacktop is down, they'll start adding the Tapeta on top, so it's a relatively quick process really.
Arc said the Stobart Group would undertake the construction work at Newcastle, while Tapeta Footings would lay its second surface at a British racetrack following on from Wolverhampton.
Currently only four racetracks around the world feature the Tapeta surface: Tapeta Park in Tasmania, Meydan in Dubai UAE, Golden Gate Fields in Northern California and Presque Isle Downs in Pennsylvania.
I spent most of last winter overseas and 50% of my time this summer visiting Tapeta installations in five countries, which obviously leaves little time for training.
No worry is too small for Dickinson, who, along with his girlfriend and training partner Joan Wakefield, built Tapeta Farm with both turf and all-weather composite running surfaces that include uphill gallops for stamina building.
By the time racing commences in November the new Tapeta track will be laid on the outside of the turf jumps track ensuring horses and jockeys can race on the turf as they will continue to do so once the whole project is completed.
We've resurfaced the Tapeta gallops - it (Tapeta) is now into its 10th version - and we also have six grass gallops.
We were not running well here and still couldn't win on the Tapeta.
But experts who do follow every moment of the DIRC tell me criticism of the Tapeta surface ripped up this week to be replaced by dirt is ill-informed nonsense.
Both races are over 2,000 metres on the Tapeta, the same course and distance as the $10 million Dubai World Cup and the Godolphin trainers are particularly well represented in the Thoroughbred version.
Monday's other workouts were turned in by Wood Memorial winner Tapit, who went 5 furlongs without an official clocking on an all-weather surface at trainer Michael Dickinson's Tapeta Farm in Maryland; Fountain of Youth winner Read the Footnotes (4 furlongs in 47 3/5 at Churchill), and Hollywood Futurity winner Lion Heart (4 in 47 4/5 at Churchill).
This looks easier than those two contests, she's 1lb lower, and you couldn't rule out improvement on only her second start on Tapeta from a handy stall (one) from which to attack.