Cook : EMBRYOLOGY OF RHYTIDOPHYLLUM 183 
I wish at this time to express my thanks to Professor C. F. 
Baker of the Estacion Central Agronomica, Santiago de las Vegas, 
Cuba, for assistance in securing the material; to the workers of the 
New York Botanical Garden for its determination ; and to Professor 
F. E. Lloyd of the Desert Botanical Laboratory, Tucson, Arizona, 
for reviewing the manuscript and for valuable suggestions. 
The Rhytidophyllum crenulatum DC. was collected on the 
walls of Fort Cabafias, Havana, Cuba, and the R. _ tomentosum Mart. 
was collected on the hills near the village of Managua in the Prov- 
ince of Havana, Cuba. Specimens of both collections are depos- 
ited in the herbarium of the New York Botanical Garden. 
EsTacion CENTRAL AGRONOMICA, 
ANTIAGO DE LAS VEGAS, CUBA. 
* LITERATURE 
Cook, M. T. Development of the embryo-sac and embryo of 
Castalia odorata and Nymphaea advena. Bull. Torrey Club 29: 211- 
220. fi. J2, J7. 1902, 
Coulter, J. M. & Chamberlain, C. J. Morphology of the angio- 
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Hanstein, J. Die Entwicklung des Keimes der Monokotylen und 
Dikotylen. Bot. Abhandl. 11: 1-112. p/. 7-78. 1870. 
4. Hofmeister, W. Neuere Beobachtungen iiber Embryobildung der 
Phanerogamen. Jahrb. Wiss. Bot. 1: 82-188. A/. 7-0. 1858. 
Johnson, D. S. On the development of the Saururus cernuus L. 
Bull. Torrey Club 27: 365-372. p/. 237. 1900. 
6. . Seed development in the Piperaceae and its bear- 
ing on the order. Johns Hopkins Univ. Circ. 178: 28-31. 1905. 
7. Lewis, C. E. Studies on some anomalous dicotyledonous plants. 
Bot. Gaz. 37: 127-138. pl. 7, 8. 1904. 
. Mottier, D. M. The embryology of some anomalous dicotyledons. 
Ann. Bot. 19: 447-463. p/. 26, 27. ° 
’ Riddle, L.C. The embryology of Adyssum. Bot. Gaz. 26: 314- 
324. pl. 26-28. 18098. ee 
to, Schaffner, J. H. Contribution to the life history of Sagztfaria 
variabilis. Bot. Gaz. 23: 252-273. pl. 20-26. 1897. * 
Strasburger, E. Ein Beitrag zur Kenntniss von Ceratophyllum 
submersum und phylogenetische Eréterungen. Jahrb. Wiss. Bot. 
37: 477-526. pl. Q-1I. 1902. 
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