﻿CURRENT LITERATURE 



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''Gymnosporangiumjuniperi-virginianae and G. globosum cause the formation 

 of large galls on the younger branches of Juniperus nrginiana. The galls 

 arise from the axils of the leaves and are evidently transformed axillary buds. 

 Young galls have two distinct fibrovascular systems, one of which is a leaf trace 

 bundle, and the other a stem. The more or less modified stem which enters the 

 base of the older galls gradually breaks up and radiates outward, deeper in the 



are usually to be found adhering to the older galls. Normal stems sometimes 

 appear to have grown out from the surface of the older galls. Accessory stem 

 structures occur, which probably originate by a branching of the main stem in 

 the gall. Broad, raylike masses of parenchyma, surrounded by tracheids, are 

 of rather common occurrence. Irregularly twisted masses of fibrovascular 

 tissue occur which are similar in many respects to like structures in traumatic 

 wood. Cells which are transitional between parenchyma and tracheids are 

 quite abundant. The irregularly running bundles in the gall are composed 

 largely of scalariform tracheids." 



Pino* on the well known and very conspicuous round gall of the golden rod. 

 This paper is more entomological than botanical, but contains much that is 

 interesting to the botanist. The author describes the gall which is restricted 

 to Solidago canadensis and caused by the larva of Eurosta solidaginis Fitch. 

 The adult insects emerge in May, deposit their eggs on the surface of the grow- 

 throughout the following winter, and also gives the life history of the beetle 

 {Mordellistina unicolor Lec.) which inhabits the gall, and a list of other insects 

 found associated with the gall. It may be too much to expect the entomologist 



nection with the study of the larva, it would certainly have added much to the 

 paper if the author had given some attention to the host tissues to which the 

 stimulation was applied. 



An interesting paper is one by Cobb* on a nematode disease of sugar cane 

 and banana. The author calls attention to the outbreaks in Fiji, Hawaii, and 

 Jamaica, describing the symptoms of the disease and the causal organism. 



Another very valuable paper is by Felt, 6 who has made extensive studies 

 of the gall midges in recent years. Although this paper is primarily entomo- 

 logical, it contains descriptions of many galls, some of which are rather difficult 



4 Chi Ping, Some inhabitants of the round gall of the golden 

 •ndZool. 7:161-170. iois. 



iana. Jour. Ag'ri/ Research 4:561-568. 1915. 

 6 Felt, E. P., A study of gall midges, III. 30th Re] 



