Ovule of Bowenia spedabilis. 
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drawing of median longitu- abnormal ovules, x 10. p.c. — pollen-chamber; p.= upgrowth of prothallus into nucellus tissue ; n. = 
dinal section of young ab- free part of nucellus ; 0. = outer flesh of integument ; n.t»s. = fused layers of nucellus, inner flesh, and 
normal ovule, x 12. stone layer ; o.b. = outer integumental vascular bundle. 
