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The testa develops from the tissue, the integument, originally surrounding the ovule.
1840, James Scott Bowerbank, A History of the Fossil Fruits and Seeds of the London Clay, page 30:
The seeds are furnished with a reticulated testa, very much in appearance like that of the seeds of two closely-allied pericarps in the cabinet of my friend Mr. Ward, of Wellclose-square, the names of which I have been unable to obtain, but which present strong evidence of belonging to the Malvaceæ.
1969, C. W. Bennett, Seed Transmission of Plant Viruses, Alison Smith, Advances in Virus Research, Volume 14, page 224,
In tests with the Lincoln and Virginia varieties of cowpea, Crowley (1959) found that, in plants infected with bean southern mosaic virus before blossoming, the virus was present in nearly 100% of the testae and endosperms of seeds of both varieties, but could not be detected in the embryos.
1977, Commonwealth Scientific, Industrial Research Organization, Australian Journal of Plant Physiology, page 354:
Thus, two conditions must be satisfied for the testas to have this effect: contact between the testas and the radicle, and the presence of at least half of the testas.
2005, D. W. Dickson, D. De Waele, Nematode Parasites of Peanut, Michel Luc, Richard A. Sikora, John Bridge, Plant Parasitic Nematodes in Subtropical and Tropical Agriculture, page 419,
A. arachidis is a parasite of pods, testae, roots and hypocotyls, but not the cotyledons, embryos or other parts of the plant (Bos, 1977a; Bridge et al., 1977).
2007, J. Smartt, “Evolution of American Phaseolus beans under domestication”, in Peter John Ucko, G. W. Dimbleby, editors, The Domestication and Exploitation of Plants and Animals, page 458:
One of the most remarkable features of cultivated beans is the enormous range of testa colours and patterns which can be found.
1390, José Luís Pensado Tomé (ed.), Os Miragres de Santiago. Versión gallega del Códice latino del siglo XII atribuido al papa Calisto I. Madrid: C.S.I.C., page 133:
Et avia ẽno rrostro hũu palmo et meo en longo et ẽna barua hũu palmo, et ẽno nariz hũu meo palmo; et ẽna testa hũu palmo et pouquo mais
He had a palmspan and a half in his face, and in the beard a palmspan, and half one in the nose; and in the front he had one palmspan and a little more
1434, A. López Carreira (ed.), Libro de Notas de Álvaro Afonso, doc. 90:
os quaes roçiins era huun delles ven preto con hun signal enna testa et ho outro ben çerbyño con huna mancha enna testa
one of that horses was really dark, with a signal in his forehead, and the other was tawny with a spot in his forehead
“testa” in Xavier Varela Barreiro & Xavier Gómez Guinovart: Corpus Xelmírez - Corpus lingüístico da Galicia medieval. SLI / Grupo TALG / ILG, 2006-2016.
“testa”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
“testa”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
testa in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
testa in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
“testa”, in Harry Thurston Peck, editor (1898), Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
testa in Ramminger, Johann (2016 July 16 (last accessed)) Neulateinische Wortliste: Ein Wörterbuch des Lateinischen von Petrarca bis 1700, pre-publication website, 2005-2016
“testa”, in William Smith et al., editor (1890), A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin
Cravens, Thomas D. Cross-language evidence in etymology: The origin of 'testa' as 'head' in Romance. Neuphilologische Mitteilungen. 83: 53–60.
^ De Vaan, Michiel (2008) Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 617
In Rumantsch Grischun, the literary standard language, testa is used in the figurative sense, and chau in the anatomical sense. Usage differs somewhat, however, between dialects.