TABLE OF CONTENTS, VOLUME X, 1923 
No. 1, January 
Page 
Revision of the South American species of Cuscuta II (with Plates I-V) 
T. G. Yuncker 1 
A comparative study of sand and solution cultures of Marquis wheat 
(with one text figure).A. L. Bakke and L. W. Erdman 18 
The gregarious flowering of the orchid Dendrobium crumenatum 
William Seifriz 32 
Australasian botanical notes I. Queensland and New South Wales 
(with five text figures). Douglas Houghton Campbell 38 
No. 2, February 
Alternation of sexes and intermittent production of fruit in the spider 
flower (Cleome spinosa) (with one text figure and Plate VI) 
A. B. Stout 57 
Internal decline of lemons I. Distribution and characteristics (with 
Plate VII) 
E. T. Bartholomew, J. T. Barrett, and H. S. Fawcett 67 
The relation of temperature to the Fusarium wilt of the tomato (with 
one text figure and Plates VIII-XI). Edward E. Clayton 71 
Amylase in the spores of Rhizopus tritici and Rhizopus nigricans 
L. L. Harter and J. L. Weimer 89 
Observations on the causes of gregarious flowering in plants (with 
Plate XII). William Seifriz 93 
No. 3, March 
Note on an indirect effect of spraying potatoes with Bordeaux mixture 
(with two text figures).J. T. Rosa, Jr. 113 
Internal decline of lemons II. Growth rate, water content, and acidity 
of lemons at different stages of maturity.E. T. Bartholomew 117 
Influence of temperature on the pectinase production of different 
species of Rhizopus.J. L. Weimer and L. L. Harter 127 
The relation of soil moisture to the Fusarium wilt of the tomato (with 
Plates XIII-XV). Edward E. Clayton 133 
Studies in the morphology of Riccardia pinguis (with three text figures 
and Plates XVI-XIX). Amos M. Showalter 148 
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