I'd I'ffsif/C f''iiii>/i. ()/ I /h'liois. I.S8 



tlio ruptnrt'(l I'pidcnnis. Stipe white, liliforni, nearly ei|iialiii^ the 

 eloiijiati' elliptical spore, which is constricted in the middle, lower article 

 elongate-turljinate, upper obtuse, ellii)tical or ovate-glol)ose.— Duby, 

 Botanicon Ciallicuni, Vol. II. p. 888. 



Oil lesives of Asfrr ^Iiorfii: MeLeaii. July IT). 280S and 

 2;iO'.», Auf?. 4. 2807, Au<^-. C^, 2m). A. na ij if ti folium: McLean. 

 July 7. 2:n:} and 2315. July 12. 2H11I. July 15. 2:515. July Ki, 

 2:n'(). July 2U. 231S. Aug. 1," 2820. Aug. 4. 2810. Aug. C. 2811. 

 2812. Oct. 11». 1894; Ogle. Sept. 28. ()141; Fulton. Oct. 8. 1787. 

 A. niisrr: McLean, Oct. 11, 1883. A. Xora^-Anf/Iice: McLean, 

 July 25. 2814: Stephenson. Sept. 18, 588(1 Asfn- f<j)s.: McLean, 

 July 7, 2828. July 14. 5587. July 17. 5581. Oct. (>. 17U7: Adams. 

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

 K). 10S8. Aug. 17. 1128; McHenry. Aug. 24, 126<>. Aug. 81, 

 18SS. 



There is no apparent reason for keeping separate the vari- 

 able forms known as P. aderis.^ Schw.. and P. Gerard ii, Peck. 

 On A. SdgiffifoJiii^ 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 cjuickly 

 die. the spores are very poorly 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 Avith the epidermis, the outer, younger, 

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

 very rarely occur on the npper side of the leaf. On Asfer Nor(r- 

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

 darker In'OAvn, 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 less rounded holes. 



Again. Schweinitz's name (N. Am. Fungi [1884] p. 206) 

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

 [1828-80] p. 888). F'or this reason the name P. Gprarclli. 

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

 [1870] p. 01 ) 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 Europe. Three names have been 

 14 



