Oct. 7-Dec. 30. 1918 Illustrations XI 



Page 

 diagram of a trinucleate irregular basal cell from the tip of which a tri- 



nucleate aeciospore initial has been cut off. L. — A diagram of part of an 

 irregular compound fusion cell. M. — ^A basal cell with the nuclei in early 

 prophase. N. — Partof a basal cell. O. — A later stage than the preceding. 

 P. — Metaphase of the division in the basal cell. Q. — Early anaphase, a 

 little later than the stage in figiu-e P. R. — Midanaphase of the division. 

 S. — A later stage of anaphase than in figtu-e R. T. — Final anaphase. 

 U. — Telophase. The two groups for each pole are still distinct. V. — Telo- 

 phase. The two groups at each pole have condensed to single masses. 

 W. — Prophase of the division in the seciospore initial. X. — Final telophase 

 of the same. Y. — An aeciospore chain in section view. Z. — A large ma- 

 ture aeciospore in surface view. AA. — A nucleus from a mature aeciospore . . 660 

 Plate 59. Cronartium ribicola: A. — Germinating aeciospores. B. — Sectional 

 view of the aeciospore wall showing the manner in which the germ tube is 

 constricted. C. — A binucleate cell from the mycelium in a leaf of Ribes sp. 

 D. — A binucleate haustorium from a host cell of Ribes sp. E. — A uredinial 

 basal cell. The nuclei are in prophase. F. — Metaphase of the primary 

 division in the basal cell. G. — Early anaphase of the same division. H. — 

 A later stage of the anaphase. I. — Final anaphase. J. — A binucleate ure- 

 diniospore initial. K. — Metaphase or early anaphase of the division in 

 the initial. L. — Late anaphase in the initial. M. — Late anaphase group 

 from the initial, for comparison with figure L. N. — A basal cell bearing a 

 stalk cell surmounted by a nearly mature urediniospore (a), and a secondary 

 urediniospore initial {b). O. — Metaphase of the secondary division in the 

 basal cell, preparatory to the formation of a secondary urediniospore initial. 

 P. — A mature tirediniospore. Q. — A germinating urediniospore in 

 sectional view. R. — A germinating lu-ediniospore. S. — A telial basal cell. 

 T. — Metaphase of the division in the telial basal cell. U. — Late anaphase 

 of the same. V. — Final anaphase of the same. W. — Telophase of the 

 same. X. — A diagram of a telial unit column. Y. — The two nuclei of the 

 yoimg teliospore just previous to fusion. Z. — The two nuclei in the process 

 of fusion. AA. — The large fusion nucleus. BB. — The fusion nucleus, 

 slightly decreased in size. CC. — The mature fusion nucleus 660 



Further Data on the Susceptibility of Rutaceous Plants to Citrus 



Canker 



Plate 60. Naturally occurring Citrus-canker lesions on leaves of Chaetosper- 



tnum gluiinosa 666 



Plate 61. A. — Hesperethusa crenulata, showing discolorations resulting from 

 inoculations with Pseudomonas citri. B. — Paramignya longipedunculata, 

 showing discolorations arotmd punctiu-es made with P. citri on leaves 666 



Plate 62. A. — Atalantia citrioides, showing positive results following inocula- 

 tion with Pseudomonas citri. B. — Fortunella hindsii, showing results of 

 inoculation with rain water on leaves. C. — Fortunella hindsii, showing 

 results of inoculation with P. citri on leaves 666 



Plate 63. Evodia ridleyei: A. — Stem inoculated with tap water. B, C. — Two 



twigs inoculated with Pseudomonas citri 666 



