Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 528
difference.The roughening of the surface by spines or knobby protuberances,as shown at a, is a very common feature ; and this seems to enablethe pollen-grains more readily to hold to the surface whereon theymay be cast. Besides these and other inequalities of the surface,,most pollen-grains have…
Microscopy · Biology
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