2 embryos ina single sac, one developed from the eee 
370 BOTANICAL GAZETTE 
finding no variations in the species, that the pollen s 
produced by some forms had no fertilizing power. These re 
he published in 1897,5 with the statement that he hoped later to 
discover whether there is actual parthenogenesis or whether the 
embryo arises from the nucellar tissue. With this purpose 
view, Murbeck examined numerous species of the section Evat- 
CHEMILLA, but his important results are mainly derived from 4. 
alpina. He has traced every stage of development from ge 
archesporial cell to the formation of the embryo, and publish 
his results in 1901.6 He found a central mass of arche: 
cells, and that the numerous primary sporogenous © cells may : 
which may give rise to embryo sacs. In regard to chromosome — 
reduction, he observed in a pollen mother-cell of A. arvensis oe 
that the reduction number was 16, but he claims that in oe 
nogenetic species there is no reduction of chromosomes. He i 
_ shows that there is no direct relation between endosperm-! —— 
_ tion and embryo-formation. A noticeable fact is that i ae 
egg divides the whole egg-apparatus stretches far into : 
and then division takes place without fertilization, 2 | 
er embryo being developed. The first division takes place W 
_ flower is still in developmental stages. Murbeck also 
other from a synergid. . rE lic 
The two cases described by Juel and Murbeck, oe 
frum purpurascens, described in this paper, are the only ¢ Po 
true parthenogenesis thus far recorded among . : 
though of course the phenomenon is Common enous: among 
certain lower plants. The so-called cases of ee genie 
— seed-plants, as Coelobogyne ilicifolta, Mere = 
vegetativ embryobilding hos flertalet Alchemillor och den | 
fotmbestindigheten inom slagtet som densamma innebar. — 
= la. ands sie 
arthenogenetische oo in der Gattung Alc’ hemi — 
: sitets o Ask 36 : 1-40. 6 pls. 190 — 
