Panisific FiitKji of I/liiioii^. 188 



tlie ruptured epidermis. Stipe wliite, iiliform, nearly equalinji tlie 

 elongate elliptical spore, which is constricted in the middle, lower article 

 elongate-turbinate, up])er obtuse, elliptical or ovate-gloVjose. — Buby, 

 Bt)tanicon (iallicnm, Yol. II. p. 888. 



On leaves of Aster short ii: McLean. July 15. 2808 and 

 28(n). Aug. 4. 2807, Aug. 6. 280(>. A. sagittifolius: McLean. 

 July 7. 2818 and 2815. July 12, 2819. Juiy 15. 2815. July 16, 

 2816. July 21). 2818, Aug. 1, 2820. Aug. 4. 2810. Aug. 6. 2811. 

 2812, Oct. 19. 1894: Ogle. Sept. 28. 6141; Fulton. Oct. 3. 1787. 

 A. miser: McLean. Oct. 11. 1883. A. Nova'-Anglice: McLean. 

 July 25. 2314: Stephenson. Sept. 18. 5836. ' Aster sps.: McLean, 

 July 7. 2823. July 14. 5587. July 17. 5581. Oct. 6. 1797: Adams. 

 July 10. 5455: Tazewell. July 22. 2821 and 2822: Piatt. Aug. 

 16.108:3. Aug. 17. 1128: McHenry. Aug. 24. 1269. Aug. 81. 

 18S8. 



There is no apparent reason for keeping sei)arate the vari- 

 able form.s known as P. aster is^ Schw.. and P. Gerardii, Peck. 

 On A. sagittifoliiis both are found on the same leaf in several 

 instances. The younger more rapidly grown specimens are 

 lighter colored, and there are all degrees of distinctness and 

 confluence of the sori. When on thin leaves the spots quickly 

 die. the sjjores are very poorh' developed, light-colored, thin- 

 walled, and very fragile. In other cases the sori are somewhat 

 circinate in arrangement and not crowded. The central and 

 older ones are covered with the epidermis, the outer, younger, 

 and lighter brown ones burst through and are thus naked. Sori 

 very rarely occur on the upper side of the leaf. On Aster Nor<v- 

 Anglid' the spores are better developed, plumper, stronger, 

 darker l)rown, yet on dead spots are the opposite. Here the 

 sori are usually much scattered, not collected in clusters. 

 Sometimes on thin leaves of several species, dead spots soon fall 

 out. leaving more or le.ss rounded holes. 



Again. Schweinitz's name (N. Am. Fungi [1884] p. 296) 

 is untenable, having been previously used by Duby (Bot. (iall. 

 [1828-30] p. 888). For this reason the name P. Gerardii, 

 much more recently given by Peck (25 Rep. N. Y. State Mus. 

 [1870] p. 91) should be adopted if either. But there is a fur- 

 ther question, whether or not the American specimens are spe- 

 cifically distinct from those of P]uro})e. Three names have been 



14 



