1910] SMITH—ZAMIA FLORIDANA I4I 
Summary 
1. The young staminate and ovulate strobili can be distinguished 
by the difference in breadth, number of sporophylls, and number of 
meristematic points. 
2. There is probably a single archesporial cell giving rise to a 
group of cells, one of which becomes the megaspore mother cell. 
3- There are four potential megaspores, the lowest one becoming 
the embryo sac, whose development agrees with the accounts of 
other cycads in the main points. 
4. The “spongy tissue” is an active, nutritive tissue, adding to 
its width by division of its cells as it is encroached upon by the embryo 
sac. 
5. In its final degeneration, the cells of the “spongy tissue” 
nearest the embryo sac are first attacked, and the smaller cells outside 
them take their place, becoming large, swollen, and nutritive in 
function. 
SMITH COLLEGE 
NORTHAMPTON, Mass. 
LITERATURE CITED 
SMITH, FRANCES Grace, Morphology of the trunk and development of the 
rpg of cycads. Bort. GAZETTE 43:187-204. pl. 10. 1907. 
- Lane, W. H., Studies in the development and morphology of cycadean 
Sporangia. 7 The ovule of Stangeria paradoxa. Annals of Botany 14: 
mi pls. 17, 18. 1900. 
, M., Recherches sur les Cycadées, III. — du Cycas 
sircinales ray Jard. Buitenzorg 4:1-11. pls. 1-3. 1 
— C. J., The ovule and see a iiakes of Dioon edule. 
Bot. GazettE 42:321~-356. . 13-15. : 
Ceaeace: 1 MarGaret, The spongy teoile A STRASBURGER. Science N.S. 
18: 308-311. 1903. 
6. G, E., Undersogelser og Betragtninger over Cycadeerne. Oversight 
K. Vidensk. Selsk. Forh. pp. 100, 101. 1877. 
IkENo, S., Untersuchungen iiber die Entwickelung der Geschlechtorgane 
und der Vergak der Befruchtung bei Cycas revoluta. Jahrb. Wiss. Bot. 32: 
557-602. pls. 8-10. 1880. 
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