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8.25<br />
8.25 Mature pollen grain of the dicotyledon Malva<br />
(mallow). NOle that the exine is coarsely ornamented<br />
with large spikes. The grains are insect·dispersed and at<br />
germination the pollen tube emerges through one of the<br />
numerous gl:rm pores. (SEM x 2,700.) (Copyright of Dr<br />
James H. Dicksoll.)<br />
I Style 2 Srigmatic; ridges 8.26 Surface detail of the stigma of the monocotyledon<br />
TlIlipa (tulip). In A, Ihe style (1) expands into three ridges (2)<br />
reflecring the trilocular nature of its ovary. The surfaces of<br />
Ihese ridge-50 (B) bear closely crowded, shorl glandular<br />
trichomes in which pollen grains become enmeshed. (SEM, A x<br />
18, H x 36.)<br />
8.27 TS and LS of the fruit uf rhe<br />
monocotyledon Narcissus (daffodil). A<br />
shows irs trilocular nature and rhe axial<br />
placentation of ,he seeds (1). R illustrates<br />
the inferior fruit lying al rhe base of rhe<br />
withered corolla rube (2). Bract (3).<br />
I Stt
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