502 



BOTANICAL GAZETTE 



[JUNE 



ovule, but shortly before pollination the tip of the ovule protrudes 

 from between the scales, and with its development they become 

 relatively less conspicuous. 



Ovule 



Historical. — The ovule of Taxus has been the subject of con- 

 siderable discussion among botanists. The earlier taxonomists, 

 such as Linnaeus (17) and Jussieu (16), regarded the ovule of 



Figs. 34-42. — Fig. 34, long section of primary shoot showing lateral axillary rudi- 

 ment (r) of secondary shoot; fig. 35, older stage, rudiment become conical; fig. 36, 

 rudiments of two secondary shoots, primary axis tip between; fig. 37, axis tip of 

 secondary shoot showing bulge indicating beginning of integumentary zone; fig. 38, 

 older stage showing integumentary zone more distinct and differentiation of arche- 

 sporium (for detail see fig. 61); fig. 39, older stage showing young integument and 

 position of sporogenous tissue (inclosed by dotted line); fig. 40, young ovule about 

 time of pollination, showing barrel-shaped integument and large open micropyle; 

 figs. 41, 42, older ovules and closure of micropyle by plug tissue (for details see figs. 66, 

 67); figs. 34-39, X80; figs. 40-42, X36. 



