^36 



14 Journal of Mycology [Vol. 10 



usually numerous, peripheral, capitate, smooth, 40-50 ! J - long, head 14-20 

 i). broad. 



III. Teleutosori amphigenous, or sometimes only hypophyllous, small, 

 irregularly roundish and scattered, or somewhat coalescing, subepider- 

 mal, at first light reddish brown, becoming deep chocolate-brown ; teleu- 

 tospores prismatic, 12-14 by 30-44 ,u, wall smooth, cinnamon-brown, uni- 

 formly thin, not thickened at apex. 



Spermogonia and aecidia on Larix, but not yet collected. Uredo 

 and teleutospores on Populus deltoides Marsh. (P. Medusae Benth., P. 

 Canadensis Moench., P. monilifera Ait., P. angulata Ait.), P. grandiden- 

 tata Michx., / ; . trcmuloidcs Michx.. P. balsamifera L., P. angustifolia Jas., 

 and P. trichocarpa Torr. & Gr. Common throughout the United States 

 and Canada. 



2. Uromyces Phaseoli (Pers.) Wint. This is a very com- 

 mon rust on various species of Phaseolus, Strophostyles and 

 Vigna, Nevertheless its aecidial form. is rarely seen, and it has 

 been suggested that the American form might be heteroecious. 

 Material for the cultures was collected near Lafayette, on Stro- 

 pJiostylcs hclrola (L.) Britt. {Phaseolus diversifoUus Pers.). 

 It was sown, May I, on Euphorbia commutata Engelm., with no 

 infection. ( n May 15, a sowing was made on Strophostyles kel- 

 rola, which gave abundant spermogonia on May 26, and well 

 developed aecidia began to appear on June 4. Five subsequent 

 sowings were made, but owing to difficulty in keeping the host- 

 plants in flourishing condition only two of these gave positive 

 results, and even these were less abundant than in .the first trial. 

 The autoecious character of the American form, however, is 

 well demonstrated. It should be said that the somewhat common 

 aecidium on Apios and Ampliicarpa holds a doubtful relation to 

 the bean rust, and is better considered distinct until positive 

 relationship is established. 



3. I'komyces Lespedezae-procumbentis (Schw.) Curt. 

 This is a wide spread, and often abundant rust, occurring on 



various species of Lespedeza. No aecidium has ever been found 

 clearly associated with it. The small and inconspicuous Aecidium 

 leucospermum B. & C, rarely collected, has been suggested as a 

 possible alternate form, but not very confidently. 



Excellent teleutosporic material was obtained by the writer 

 at Fair Oaks, Ind., in March, on the upright stems of Lespedeza 

 capitata Michx. It was not until late in May that a host-plant 

 was well established in the greenhouse. A sowing of spores was 

 made on May 28, the host being L. capitata. Infection resulted, 

 but the development was slow, clearly due to inferior growth 

 conditions. On June 14 the first spermogonia protruded, soon 

 becoming exceedingly numerous, and on June 18, the minute, 

 colorless aecidia began to appear in great numbers. The typical 

 form of Aecidium leucospermum was the result. 



4. Puccinia caulicola Tr. & Gall. Fine teleutosporic ma- 

 terial of this species on the stems of Salvia lance olat a Willd. was 



