Handbook of practical botany for the botanical laboratory and private student (1908)
Strasburger, Eduard, 1844-1912, Hillhouse, William, 1850-1910 · London, S. Sonnenschein; New York, Macmillan · leaf 410
ns,which partly are external,and partly lie sunk in itstissue ; or may even showpollen - tubes {t), de-veloped from these pollen-grains, which penetratethe upper part of the nucellus, in order to reach the external layer of the embryo-sac,the embryo-sac (e), of elliptic outline, filled with… … FiG. 136.—Median longitudinal section througha receptive ovule of Picecc vulgaris, Lk. e, embryo-sac filled with endosperm ; a, ventral portion, andc, neck of an archegonium ; n, the nucleus of th-eoosphere ; nc, the nucellus of the ovule ; 7^, pollen-grains upon and in the nucellar apex ; t,…
Botany · Plant physiology · Microscopy
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