Gnetum africanum, with Notes on Gnetum scandens. 1121 
Text-fig. 15 represents a series of sections through the micropylar tube 
of an ovule of G. africanum . probably preserved soon after fertilization. 
B 
Text-fig. 13. A. Ovule in which the micropylar tube is closed, and the nucellar cap is 
hardening,<• but stretching has hardly yet begun. B. The region between the two integuments has 
undergone considerable extension, C (shown in situ) is about the same stage as B, but the free nucellar 
apex is unusually long and narrow. The closing tissue of the micropyle forms a conspicuous 
lignified rod. Ab.ES. = abortive embryo-sac; cus = interovular portion of cushion; c = bundle 
which has bent outwards into the interovular portion of cushion, and is now bending inwards again 
to enter ovule (see p. 1109) ; large black dots (/) = phloem of bundles. 
