124 



Mycologia 



35. Uromyces proeminens (DC.) Pass, (on Euphorbiaceae) 

 Chamaesyce hypericifolia (L.) Millsp., Orotina, Dec. 29, 191 5, 



Chamaesyce sp., Alajuela, Jan. 7, 1916, II, III, 384, 



An autoecious, long-cycle rust, widely distributed over the 

 earth, and quite variable in morphological characters. 



36. Uromyces Myrsines Diet, (on Myrsinaceae) 

 Ardisia compressa H.B.K., south of Cartago, Dec. 22, 191 5, III, 



A short-cycle rust of distinctive gross appearance, known on 

 species of Myrsine from Bolivia and Brazil. This is the first 

 record for North America. It is quite possible that Uromyces 

 marginatus Bomm. & Rouss. (Bull. Soc. Bot. Belg. for 1896, 

 page 156) may be synonymous with this species. It was de- 

 scribed on an undetermined subcoriaceous leaf from Costa. Rica, 

 of which no material has been seen by the writer. 



37. Uromyces maculans (Pat.) comb. nov. (on Solanaceae) 

 Cestrum nocturnum L. 



The present record is founded on a collection made at Guade- 

 lupe near San Jose, March, 1909, by A. Tonduz, and communi- 

 cated to the writer by N. Patouillard. It was on this collection 

 that Patouillard founded the name U. Cestri var. maculans Pat. 

 (Bull. Soc. Myc. Fr. 28: 140. 1912). It differs from U. Cestri 

 in the more globoid and somewhat smaller aeciospores, as well 

 as in the much thinner-walled teliospores. Uromyces venustus 

 Diet. & Holw., of Mexico, has a rostrate teliospore, while U. 

 cestricola Speg., of South America, has the peridial cells so 

 finely verrucose as to appear smooth. From the three forms on 

 Cestrum already recognized as species, this one appears abun- 

 dantly different, and worthy of specific recognition. All of them 

 are aeciogyrinious, and produce no urediniospores. They may 

 be thus distinguished: 



Teliospores rostrate U. venustus 



11, in, 319- 



280. 



Teliospores rounded or obtuse 



Teliospore-wall thin (1.5-2.5^) 

 Teliospore-wall thick (2.5-5 ix) 

 Teliospores largely ellipsoid 

 Teliospores largely globoid 



U. maculans 



Telia 



U. Cestri 

 U. cestricola 



