36 INDEX TO AMERICAN BOTANICAL LITERATURE 
Watson, E. E. The ie Heliocarpus. Bul. Torrey Club 50: 
109-128. 16 Mr 19 
Includes 3 new species tk iroalest America. 
Weimer, J. L., & Harter, L.L. Influence of temperature on the 
pectinase production of different species of Rhizopus. 
Am. Jour. Bot. 10: 127-132. 30 Mr 1923. 
We'mer, J. L., & Harter, L.L. Pectinase in the spores of Rhi- 
zopus. Am. Jour. Bot. 10: 167-169. 18 Ap 1923. 
Weir, J. R. The genus Polystictus and decay of living trees. 
Phytopathology 13: 184-186. 4 Ap 1923. 
Weir, J. R. Porta papyracea (Schw.) Cke. Phytopathology 
13: 187... 4. Ap 1923. 
Weston, W. H. A method of treating maize seed to destroy 
adherent spores of downy mildew. Jour. Agr. Research 24: 
853-860. 9g Je 1923. 
Wherry, E. T. Wall ferns in Wilmington, North Carolina. 
Am. Fern Jour. 13: 17, 18. 13 Mr 1923. [Il ust.] 
bees: a R. A mid-Devonian Callixylon. Torreya 23: 32, 
p 1923. 
sla R.S. Brachymenium condensatum, sp. nov. Bryolo- 
gist 26: 2, 3. pl. 2. 15 Mr 1923. 
‘Willis, L. G., & Carrero, J..O. Influence of some nitrogenous 
fertilizers on the development of chlorosis in rice. Jour. 
Agr. Research 24: 621-640. 19 My 1923. 
Wilson, E.H. Northern treesin southern lands. Jour. Arnold 
Arb. 4: 61-90. 8 My 1923. 
Wilson, R. W. Life history of Cedrus atlantica. Bot. Gaz. 75: 
203-208. pl. rr. 20 Ap 1923. 
Winkler, A. J. A study of the internal browning of the yellow 
Newton apple. Jour. Agr. Research 24: 165-184. pl. 1 
+ f.3; 2. 44 Ap 1683. 
Wylie, R. B. Sperms of Vallisneria spiralis. Bot. Gaz. 75: 
, 191-202. pl. 8-10. 20 Ap 1923. 
