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posits of Maryland: Pteridophyta and Spermatophyta, by 
Arthur Hollick. 
No. 86. Two New Coralline Algae from Culebra, Porto 
Rico, by M. Foslie and M. A. Howe. 
No. 87. Studies on the Rocky Mountain Flora — XVII, by 
Per Axel Rydberg. 
No. 88. Jane Colden, an early New York Botanist, by 
Anna Murray Vail. 
No. 89. Two New Species of Aytonia from Jamaica, by 
Caroline Coventry Haynes. 
No. go. Studies in North American Peronosporales —I. 
The Genus Albugo, by Guy West Wilson. 
No. g1. Costa Rican Orchids —I, by George Valentine 
No. 92. An Occurrence of Glands in the Embryo of Zea 
Mays, by C. Stuart Gager. 
No. 93. American Fossil Mosses with Description of a New 
Species from Florissant, Colorado, by Elizabeth G. Britton 
and Arthur Hollick. 
No. 94. Solution Tension and Toxicity in Lipolysis, by 
Raymond H. Pond. 
No. 95. Studies in North American Peronosporales — IH. 
Phytophthoreae and Rhysotheceae, by Guy West Wilson. 
No. 96. Studies on the Rocky Mountain Flora— XVIII, 
by Per Axel Rydberg. 
No. 97. The Sedges of Jamaica, by N. L. Britton. 
No. 98. The Genus Antrophyum—I. Synopsis of Sub- 
genera, and the American Species, by Ralph Curtiss Ben- 
edict. 
No. 99. Some Philippine Polyporaceae, by William Al- 
phonso Murrill. 
NortH AMERICAN FLoRA 
The North American Flora, designed to include descrip- 
tions of all known plants native to North America, Central 
America and the West Indies, is being issued in parts at irreg- 
ular intervals as rapidly as these parts can be prepared. 
