238 



Mycologia 



heteroecious rust known to the writer, having all spore forms and 

 yet leptopuccineous. Plants of Sisyrinchium bearing the rust, 

 sent by Dr. Sheldon in 1906, flourished well in the greenhouse, 

 but the rust gradually disappeared during the following winter. 

 The experience was repeated in 1907. In both cases by March 

 or April the rust had died out and did not again appear, although 

 the plants produced fresh leaves and flourished throughout the 

 winter months and the whole year. 



Living plants of Houstonia caerulea bearing aecia, sent by Dr. 

 Sheldon from Morgantown, W. Va., May 3, were potted inter- 

 mixed with plants of Sisyrinchium gramineum. On June 8 a 

 few uredinia were observed, but did not multiply. On May 

 18 similar plants were sent by Mr. H. S. Jackson from Newark, 

 Del. These were put into small pots, and on May 23 arranged 

 over plants of Sisyrinchium under a bell jar, where they remained 

 three days. On June 7 a great abundance of uredinia was ob- 

 served, and on July 22 telia also in abundance. As both uredinio- 

 spores and teliospores are pale and inconspicuous, they doubtless 

 appeared earlier than the record shows. 



14. Gymnosporangium Juniperi-Virginianae Schw., on 

 Juniperus virginiana L., was collected by Mr. F. D. Kern and the 

 writer at Mammoth Cave, Ky., in two rather unusual forms. 

 One form had very large galls, very irregular and much divided. 

 The other had very small galls, with one to three telia each, the 

 extruded part of the telia being noticeably fusiform. Both of 

 these forms appeared so different from the forms usually col- 

 lected farther north, that it seemed possible they might be speci- 

 fically distinct. 



The large form was sown April 13 on Mains Mains (L.) Britt., 

 M. coronaria (L.) Mill, and Crataegus punctata Jacq. On M. 

 Malus pycnia appeared April 23, but the infection was so pro- 

 nounced that the leaves were distorted and injured to an extent 

 that precluded the formation of aecia, the leaves gradually drop- 

 ping until September 26, when two, the only ones still remaining, 

 were removed for the herbarium. On M. coronaria abundant 

 pycnia appeared April 21, followed duly by aecia of characteristic 

 appearance. The Crataegus remained free from infection. 



The small form was sown April 13 on Malus coronaria and 



