31 



A NEW CALIFORNIAN RUST. 

 By E, W. D. Holway. 



Puccinia cretica. Spots none; sori powdery, scattered over both 

 sides of the leaves, cinnamon-brown, surrounded by the ruptured 

 epidermis; teleutospores smooth, elliptical, slightly constricted at the 

 septum, with the cells mostly rounded and of nearly equal size, 

 sometimes irregular and angular, not thickened at the apex; epispore 

 thin, 28-40xl6-24/A mostly 32-36x20/^; pedicel hyaline, 

 about the length of the spore, but fragile and usually broken off 

 close to it, often on the corner, or even the side of the lower cell. 



On Cressa cretica, San Pedro, A, J. McClatchie; Newark, 

 Alameda County, May, 1895, J. Burtt Davy. No uredo-spores 

 were found. 



I am indebted to Dr. Lagerheim for making comparison with his 

 Puccinia Cressce, which is different, j^cidium Cressce DC. occurs 

 on the same plants. 



THE EXPLORATIONS OF HARTWEG IN AMERICA.^ 

 By Willis L. Jepson. 



The name of Hartweg is one of the most familiar in the history 

 of botanical exploration in South America, Mexico, and western 

 America during the first half of this century. Karl Theodore 

 Hartweg, for such is his full name, was born June 18, 1812, at 

 Carlsruhe, in western Germany, which is situated on an elevated 

 table-land of the Hardtwald, and is noted for its public squares, 

 parks, and botanic garden. Veitch tells us that Hartweg was 

 descended from a long line of gardeners, and that he received the 

 benefits of an excellent education — better by far than is enjoyed by 

 an ordinary gardener. He was, for a time, in his early youth, 

 employed at the Jardin des Plantes, in Paris; later we find him in 

 England, without employment. 



1 Read before tlie Chamisso Botanical Club, May, 1893. 



Erythea, Vol. V, No. 3 [31 March, 1897]. 



