March 1905] Cultures of Uredtneae in 1904 ^ 61 



ing specimen in his herbarium, unless one from Santa Cruz, 

 Calif., collected by Dr. C. L. Anderson, November, 1875, could 

 be the one intended. This specimen, however, is said to be 

 upon Salix brachystachys. 



Although the type collection can not be accurately identi- 

 fied or duplicated, there seems to be no reason to question the 

 reference of the fungus described to the common willow rust 

 growing throughout California and the other parts of North 

 America. Dr. Farlow kindly sent me a part of his specimen 

 on 5. brachystachys, and also a specimen on S. Bigelowii, col- 

 lected in Washington by C. V. Piper in 1899, and they agree 

 in all essential particulars with the eastern collections on willow. 



I have also had the privilege, through the kindness of Mr. 

 Chas. H. Peck, of examining the type specimen of Lccyihca 

 macrosora Pk. (Bot. Gaz. 5:35. 1880), collected in Colorado 

 by Brandegee, and thought to be on Epiliobium, and find that 

 it is the nredostage of this same species of willow rust. An 

 examination of type material of Melamspora paradoxa D. & H. 

 shows no important deviation from the common form. The 

 peculiar free teleutospores figured by Dr. Dietel (Hedw. Beibl. 

 40:33. 1901) appear to be occasional reversional forms, due 

 to disturbed nutrition or some such cause. Similar isolated 

 teleutospores have been described by Klebahn in European ma- 

 terial (Ztschr. f. Pf.-Kr. 9:98). The name, Melamspora mac- 

 ulosa D. & H., is nomen nudum. It was applied to forms show- 

 ing especially bright yellow discoloration of the leaf about the 

 uredosori, but without other marked characters, as examination 

 of type material shows. 



The species may be characterized as follows : 



Melampsora Bigelowii Thuem. 



0. Spermogonia amphigenous, scattered, or somewhat gregarious, 

 minute, punctiform, pale yellow, inconspicuous, subcuticular, conical, 60-80 

 V- in diameter, 40-45 /* high. 



1. Aecidia chiefly hypophyllous, scattered or somewhat gregarious, 

 small, . 1-.2 mm. across, oblong, pale yellow fading to white, inconspicuous, 

 formed between the epidermis and mesophyll, soon naked, pulverulent; 

 aecidiospores globoid, 15-22 by 18-27 /*; wall colorless, 2-3 a* thick, finely 

 and evenly verrucose, with distinct papillae, pores scattered, noticeable. 



On Larix Lyallii Pari., Alberta, Can., and probably on other species 

 of Larix in various parts of the United States and Canada. Cultivated 

 on L. decidua Mill, and L. hricina (DuR.) Koch. 



II. Uredosori chiefly hypophyllous, usually on conspicuous yellow 

 spots, scattered or gregarious, round, .3-. 5 mm. across, orange-yellow 

 fading to pale yellow, soon naked, somewhat pulverulent ; uredospores 

 globoid, 15-19 by 17-24 a*, wall colorless, 2.5-3.5 A* thick, sparsely and 



verrucose, pores scattered, noticeable; paraphyses intermixed with 

 the spores, capitate, smooth, 50-70 A* long, heads 22-25 A* broad, wall 

 3-5 /a thick, peripheral paraphyses thinner walled and more clavate. 



III. Teleutosori amphigenous, or sometimes partly or wholly epi- 

 phyllous or hypophyllous, scattered, roundish or irregular, about .5 mm. 



oft n confluent, orange yellow becoming yellowish or purplish 



