46 



JOURNAL OF xMTCOLOGT. 



tubes, if ever, must have made their way into the leaves, I attempted in 

 a few cases to remove the glass receivers and continue the cultures in the 

 open air. This, however, was impossible, for the plants wilted to such 

 an extent that I was obliged to keep them constantly covered. European 

 experimenters usually expose their cultures to the air after a few days, 

 but it is doubtful whether this can be done in our climate except in the 

 most favorable cases, so great and sudden are the changes of moisture 

 and temperature." The results are summarized as follows : 

 Spermogonia appeared after sowing the sporidia of 

 G. f uscum, Y globosum on seedling apples, on Cratmgus oxyacan- 

 tha (very abundant), ( n O. Douglasii, and on apple leaves under 

 bell-glass. In cultures of previous years, also on C. tomentosa. 

 G macroijus on apple seedlings, on O. Bouglasii, and on shoots of 

 Pyrus arhutifolia and Amelanchier. Also in previous cultures 

 on C. tomentosa and Amelanchier. 

 G. davipes on apple seedlings and shoots of Fyrus arbutifoUa and 

 Amelanchier. 



G. biseptatum on Amelanchier leaves and shoots, and previously on 

 C. tomentosa. 



It will be noticed that Spermogonia were produced, but no ^cidia 

 appeared, and "in the absence of^cidia, can we infer anything from the 

 Spermogonia V After discussing in detail the experiments with the dif- 

 ferent species on the different host-plants, Dr. Farlow gives the follow- 

 ing as the conclusions lo be drawn : 



1 . The secidium of G. biseptatum is probably Boestelia botryapites. 



2. The secidium of G globosum^ to be kept distinct from G. fuscum, is 

 possibly JRoestelia aurantiaca. 



3. The eecidium of G. macropus is to be sought among the Boestelia 

 growing especially on apples and Amelanchier. 



The remaining three pages of the paper refer to species of Chrysomyxa 

 found by himself and Mr. Edwin Faxon in the White Mountains. On 

 the upper surface of leaves of Ledum a form was found undistinguisha- 

 ble from the teleutosporic condition of Chrysomyxa Ledi (A. & S.). 

 ''The spores were produced in small numbers in chains, but at maturity 

 became free, and were then globose or broadly elliptic, measuring 24—38 

 x20— 26/^-." Besides this epiphyllous form, which was decided to be 

 Uredo ledicola. Peck, a hypophyllous form was found whose spores "were 

 distinctly narrower and more acutely elliptical, measuring 2i— 31 x 12—19 

 /^-, and the epispore was less rough." Dr. Farlow says "there can be no 

 doubt that the hypophyllous form is the uredo of Chrysomyxa Ledi," and 

 then adds : "Whether our epiphyllous form should be considered dis- 

 tinct from the hypophyllous must, for the present, remain uncertain. I 

 found the ditferences stated above constant in all the specimens I exam- 

 ined, and they were not few in number. It may be that the two forms 

 are modifications of the same species depending on the different struct- 

 ure of the upper and under side of the leaves, but the differences are cer- 



