80 



Mycologia 



They are early naked, applanate, pulverulent, and encircled by 

 the ruptured epidermis. The secondary or true uredinia, are not 

 on hypertrophied areas, but scattered over the under surface, 

 without producing much discoloration. They arise beneath the 

 epidermis, then project above it, possibly through a stoma, and 

 expand superficially, being attached by a slender stalk, and may 

 be removed readily as a whole. There is an abundant develop- 

 ment of peripheral paraphyses, holding together at their bases, 

 and usually one-septate. The spores in the primary form are 

 somewhat larger, and very much thicker-walled than in the 

 secondary form. No telial sori have been seen, all the telio- 

 spores being produced in uredinia. 



The characters of the rust, taken altogether, show it to belong 

 to the genus Bullaria, as projected in the North American Flora, 

 and under that genus it becomes Bullaria Gouaniae (Holw.) 

 comb. nov. 



62. Puccinia heterospora Berk. & Curt. ( Uromyces Pavonine 

 Arth.) 

 On Malvaceae: 

 Malache scabra B. Vogel {Pavonia racemosa L., P. spicata 



Cav.), Mayagiiez, road to Guanajibo, March 3, pj. 

 Sida hederi folia Cav., Mayagiiez, March 13, 95. 

 Sida humilis Cav., Yauco, March 30, 104. 

 Sida procumbent Sw., Guanica, March 30, 96. 

 Sida urens L., Mayagiiez, March 4, 97, March 7, 98, March 

 20 > 99/ Barceloneta, March 6, ioj; Boqueron, March 

 11, 100; Anasco, March 28, 101 ; Yauco, March 31, 102. 

 The second host is a new one for the species. The first host 

 has been reported for the island before as the type collection for 

 Uromyces Pavoniae. While Mr. Guy R. Bisby was recently 

 studying the short cycle species of Uromyces represented in the 

 Arthur herbarium he discovered the similarity of this form to the 

 mesosporic condition of Puccinia heterospora, and upon search- 

 ing was able to find a few two-celled teliospores in the type col- 

 lection. The occurrence of two-celled teliospores is also vouched 

 for by the Sydows (Monog. Ured. 2: 59. 1909). After recog- 

 nizing the mesosporic character of the teliospores no reason could 



