[Vol. 2 

 634 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Without doubt, this misapprehension of the galls produced 

 by Vaccinium vitis-idaea is due to the scarcity of copies of 

 Woronin's original account of Exohasidium Vaccinii, for 

 Woronin is at great pains to show that to E. Vaccinii are due 

 both shoot galls and flower galls. 



That the erroneous tendency of limiting to E, Vaccinii the 

 production of only the commonest leaf galls is potent, is ap- 

 parent from inspection of the table towards the close of this 

 paper where under the heading, * * Exobasidium Vaccinii 

 (Fuck.) Wor. The following have been referred here invari- 

 ably'' there are grouped all Exobasidium galls produced by 

 Vaccinium vitis-idaea, V. vacillans, F. arhoreum, V. penn- 

 sylvanicum, F. stamineum, Gaylussacia frondosa, G. resinosa, 

 Arctostaphylos uva-ursi, A. nevadensis, Arbutus Menziesii, 

 Rhododendron canadense, R. maximum, and Lyonia jamai- 

 censis. 



Our Gaylussacia frondosa and G. resinosa of this list merit 

 some detailed consideration for they compare very favorably 

 with Vaccinium vitis-idaea as hosts for Exohasidium Vaccinii, 

 The galls of these two species of Gaylussacia include during 

 the season two shoot forms, leaf concavity type, leaf spot type, 

 and the flower type. The flower type of gall is probably very 

 rare ; I have seen a dried herbarium specimen of it collected 

 by Dr. Farlow, at Brewster, Massachusetts, and two others, 

 preserved in alcohol in Seymour Herbarium, one of which was 

 collected by A. B. Seymour, at Woods Hole, Massachusetts, 

 and the other by Mrs. Pier, at Biddeford, Maine. These 

 flower galls have a diameter of 10-12 mm.; all the floral 

 organs are enlarged as in case of the flower galls illustrated 

 by Woronin. Bartholomew collected and distributed in his 

 * Fungi Columbiani,' 3429, the shoot gall of the wax-like or 

 coralloid type such as is produced by Vaccinium vitis-idaea. 

 Gaylussacia resinosa very frequently produces as its earliest 

 galls the other form of shoot gall with all the leaves felty on 

 the whole under surface, more or less reddened above, and not 

 deformed. Such a shoot gall is produced by Vaccinium 

 Myrtillus in Europe; it has usually been regarded by Euro- 

 pean mycologists as due to Exohasidium Vaccinii. Its regular 



