THE EMBRYO 221 



the most complete descriptions. The forms that Ernst includes 

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

 sion of the subject. 



Pseudo-pjol yembryony . 



1. Ovules Grown Together. Pirns Mains, Loranthus euro- 

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



2. Division of Xucellus. Morus alius (Hofmeister 2 ), Orchis 

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

 bica (Hanausek 37 ). 



3. Development of Several Embryo Sacs in the same Nu- 

 cellus. Cheiranthus Cheiri (Schacht 3 ). Rosa sp. (Hof meister ! ), 

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

 cum officinale (Schwere 40 ). 



True Poly embry any . 



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

 phytie tissue (vegetative multiplication or budding-). 



1. Embryos Derived from Cells of the Nucellus. Funkia 

 orata (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 "), Opuntia vulgaris (Ganong 49 ), Al- 

 chemilla pastoralis (Murbeck 90 ). 



2. Embryos from Cells of the Integument. Allium odorum 

 (Tretjakow, 36 Hegelmaier 45 ). 



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 1 "). 



2. Embryos from Synergids. Glaucium luteum (Hegelmaier 13 ). 

 Mimosa Denhartii and Schranhia uncinata (Guignard 21 ), Iris sibi- 

 rica (Dodel 51 ), Lilium Martagon (Overton 32 ), Yincetoxicum nigrum 

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

 maier 45 ), Taraxacum officinale (Schwere 4 "). Aconitum Napellus 

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

 (Guignard "). 



3. Splitting of Embryo Derived from Egg. Loranthus eti.ro- 



paeus (Braun 4 ). 



1. Embryos from Antipodal Cells. Allium odorum (Tretja- 

 kow. 3 ' Hegelmaier 13 ). 



5. Embryos from Endosperm Cells. Balanophqra elongata 



(Treub"). 



