368 BOTANICAL GAZETTE [war 
noticeable, and site might be expected, since no pollen tube has 
entered the sac to draw upon them for food supply. The syner- 
gids in the normal material were not evident in all cases after 
the embryo had begun to develop. After the first longitudinal 
division of the embryo, similar divisions may take place in ‘the 
suspensor, resulting in a massive, rather short, much twisted, 
thick-walled suspensor (fig. 15, sw). Finally, the parthenoge- 
netic embryo becomes morphologically well developed, showing — 
dermatogen, periblem, and plerome, exactly as in normal 
embryos. In fact no difference can be seen between the per- 
(fig. 16). The endosperm continues to develop until it entirely 
fills the cavity of the sac and lies in a mass about the embryo. 
Abundant seed is produced by 7. purpurascens, both from ia 
and isolated pistillate plants. The percentage of seed prot 
= ip the parthenogenetic material is quite as great as under 
= s normal conditions in the field. a 
GENERAL DISCUSSION. 
o S There have been described only two other cases of 
ee among spermatophytes. In 1898 Juel* — 
parthenogenesis in Antennaria alpina. No figures were given, 
we have to depend upon his text for the facts. In 1870. 
na noticed that plants of A. alpina were matured in 
_ cal Garden at Innsbruck when no staminate flowers wer 
3 is the rule for plants of A. alpina to have 
~ flowers, while staminate flowers are exceedingly t 
_ Mecessary to the propagation of the species. 
are not fully developed, or very seldom so, even wh 
-staminate flowers present, being functionless accordi ig the 
_ Juel maintained that Kerner did not find parthenogent oF 
true sense of the word, but only seed- development 
fertilization. A critical study of A. dioica showed that 
: _ *Parthenogenesis bei Antennaria alpina. Bot. Centralbl. 74: £369. | ae 
_— be 
_? Parthenogenesis einer angiospermen Pflanze. Sitsunge © 
7: sci i 
