1913] PACE~APOGAMY IN ATAMOSCO 380 
- YAMANOUCHI (30) this is true for the fern Nephrodium, which 
develops a haploid sporophyte from a haploid unfertilized egg. 
SUMMARY OF APOGAMOUS ANGIOSPERMS 



Pollen | Female gametophyte 
Urticaceae 
ROSGeria 5 og besides eee Defective Diploid or haploid 
Ranunculaceae : 
SNE SS rin ee Normal Diploid or haploid 
osaceae 
Aichemilla yo sds ae Defective Diploid 
Eualchimilla{ 
hymelaeaceae ; 
WTOC. os a ee Little Diploid 
Compositae ce 
Antennbtia. © oo os. kee Little Diploid 
Sereeaine AS Normal or little Diploid rene 
PEUEM rg sce See ittle Haploid or diploid 
Amaryllidaceae (Leucojaceae) Lee 
ALAMO ae eee Normal Diploid 

STRASBURGER (24) holds that a diploid egg not only is not 
fertilized, but is not capable of being fertilized. He says (p. 166): 
Womit kann namlich das apogame Ei einer Marsilia besser beweisen, dass 
es weder Befruchtungsbedurftig noch Befruchtungsfahig ist, als dass es den 
Spermatazoiden den Eintritt in das Archegonium unméglich macht? Die 
diploide Chromosomenzahl bedingt es also, dass im Ei dass Befruchtungs- 
bediirfnis sich nicht einstellt und damit auch der Reiz wegfallt, der die Tatig- 
keiten sonst anldst, ist welche die Befruchtung vorbereiten. Also kommt doch 
wohl eine grundsatzliche Bedeutung an dieser Tatsache zu, dass nicht die 
einfache, sondern die doppelte Chromosomenzahl im Kern vertreten ist. 
In the apogamous Marsilia the canal cell does not disintegrate, 
so that the sperm cannot enter the archegonium. STRASBURGER s 
idea of the incapability of the fertilization of the diploid egg, was 
worked out on theoretical grounds altogether, as is shown in the 
quotations just given, and as he said in discussing this question 
with me. 
- OVERTON (18, p. 278) says that in pollinated material he often 
found pollen tubes in the micropyles of ovules and even in contact 
with the egg, and also the fusing of the second sperm nucleus with 
the endosperm nucleus. But his preparations failed to show the 
fusion of the sperm and egg nuclei, and he adds: 
