THE EMBRYO 221 



the most complete descriptions. The forms that Ernst includes 

 under " pseudo-polyembryony " are not treated in our discus- 

 sion of the subject. 



Pseudo-poly embryony. 



1. OVULES GROWN TOGETHER. Pirus Mains, Loranthus euro- 

 paeus. Viscum album (all A. Braun 4 ). 



2. DIVISION OF NUCELLUS. Morns albus (Hofmeister 2 ). Orchis 

 Morio (Braun 4 ), Gymnadenia conopsea (Strasburger 16 ), Coffea ara- 

 bica (Hanausek "). 



<- 3. DEVELOPMENT OF SEVERAL EMBRYO SACS IN THE SAME NU- 

 CELLUS. Cheiranthus Cheiri (Schacht 3 ), Rosa sp. (Hofmeister 2 ), 

 Rosa livida (Strasburger 12 ), Trifolium pratense (Jonsson 23 ), Taraxa- 

 cum officinale (Schwere 40 ). 



True Poly embryony. 



A. Embryos derived from cells outside the sac, hence from sporo- 

 phytic tissue (vegetative multiplication or budding). 



1. EMBRYOS DERIVED FROM CELLS OF THE NUCELLUS. Funkia 

 ovata (Strasburger 12 ), Nothoscordon fragrans (Strasburger 12 ), Citrus 

 Aurantium (Strasburger 16 ), Mangifera indica (Strasburger "). Euony- 

 mus americanus (Braun 4 ), Coelebogyne ilicifolia (Braun. 4 Stras- 

 burger 16 ), Clusia alba (Goebel 67 ), Opuntia vulgaris (Ganong 49 ), Al- 

 chemilla pastoralis (Murbeck 90 ). 



2. EMBRYOS FROM CELLS OF THE INTEGUMENT. Allium odorum 

 (Tretjakow, 36 Hegelmaier 46 ). 



B. Embryos derived from cells within the sac (parthenogenesis 

 and vegetative apogamy) ; although not in the same morphological 

 category, embryos from the suspensor are also included in the list 

 (vegetative multiplication or budding). 



1. NORMAL OCCURRENCE OF Two EGGS. Santalum album and 

 Sinningia Lindleyana (both Strasburger 12 ). 



2. EMBRYOS FROM SYNERGIDS. Glaucium luteum (Hegelmaier 13 ), 

 Mimosa Denhartii and Schrankia uncinata (Guignard 21 j, Iris sibi- 

 rica (Dodel ?1 ), Lilium Martagon (Overton"), Vincetoxicum nigrum 

 and V. medium (Chauveaud 33 ), Allium odorum (Tretjakow, 36 Hegel- 

 maier 45 ). Taraxacum officinale (Schwere 40 ), Aconitum Napellus 

 (Osterwalder 52 ), AlchemiUa sericata (Murbeck 90 ), Naias major 

 (Guignard 68 ). 



3. SPLITTING OF EMBRYO DERIVED FROM EGG. Loranthus euro- 

 paeus (Braun *). 



4. EMBRYOS FROM ANTIPODAL CELLS. Allium odorum (Tretja- 

 kow. 38 Hegelmaier 13 ). 



5. EMBRYOS FROM ENDOSPERM CELLS. Balanopliora elongata 

 (Treub 49 ). 



