q 1909] SAXTON—WIDDRINGTONIA CUPRESSOIDES 177 
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= 909. 
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: Ber. Deutsch. Bot. Gesells. 21: 110-119. 1903. 
= 33- * eber die Tetradentheilung eines Drosera-Bastardes. Ber. 
3 Deutsch. Bot. Gesells. 22:47-53. 1904. 
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w 
EXPLANATION OF PLATE XI 
: All figures were drawn with the aid of a Zeiss microscope, lenses, and camera 
F lucida; figs. 4, 8, 11, 14, and 22 with a 2™™ ojl-immersion objective , and the other 
’ SSeures with various dry objectives. Magnifications were measured directly 
q by comparison with a stage micrometer in each case. Each figure is oriented 
: With the long axis of cone or ovule vertical except figs. 8 and 22. The sections 
3 Were cut out with a Cambridge rocking microtome to a thickness seit 
Fic. 1.—Median longitudinal section of very young ovule, not yet pollinated; 
a a 7, 1909. 180. agram- 
‘ - 2.—Median longitudinal section of staminate cone, slightly di 
Bc, ey the apical three-fourths of the cone are shown; January 7, 1909- X36. 
: S. 3.—Median longitudinal section of a pollinated ovule (drawn from two 
3 tin) Saainy 7, 1909. 147. 
; G. 4.—Germinating pollen grain from a similar ovule to that shown in 
a Be: * January 7, t909. X72 
: 3 IG. 5.—Median longinidingl section of central amie of ovule, showing very 
7 "8 number of megaspores (?); May 3, 1908. X 180. 
"at the -—Sketch of whole ovule in optical section se eo 
q bes of the nucellus is a pollen tube; June 30, 1908. X 
a Fic. 7, Oo = in apex of nucellus of similar age to ad shown in fig. 6; 
ety agi 1908. X 
ves « ae — part of prothallus of same ovule as jig. 7; vacuole to the 
: mbrane to the left. X1720. 
j A IG. 9.—Small part of a prothallus in the process of forming cell walls; 
| "Bust 25, 1908. 310 
Fic. 10—The tip of a pollen tube which has penetrated mek: oe 
— of fig. 9 (cut obliquely and drawn from two nas 
11.—The body cell of fig. 10 more highly magnified. es 
