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 412
Fig. 137.—Picea vulgaris, Lk. A, a ripe oosphere with nucleus, on, and ventralcanal-cell, cl. B, an oosphere during fertilisation ; s)i, the intruded spermo-nucleus ;on, the oonucleus ; p, the tip of the pollen-tube. C, an oosphere during fertilisation,siiowing the conjugation of spermo- and…
Botany · Plant physiology · Microscopy
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