1 ] 8 Twenty-fifth Rep or t on tee 8ta te Mus uem. 



23. P. AsTEEis Sehw. Aster Brand. 



Hypogenoiis ; spots suborbicular, unequal, sometimee confluent, 

 generally; concave above and convex below, yellow, often stained 

 with red purple or brown ; sori clustered, distinct, crowded or 

 confluent, surrounded by the ruptured epidermis, blackish-brown 

 or black ; spores oblong-clavate, constricted, .0015'-.0019' long, 

 .0006'-.000T broad ; peduncle slightly colored, one-half to wholly 

 as long as the spore. 



Leaves of asters, especially of Aster macrophyllus. Common. 

 July to September. 



This is a very variable species. Variety purpiorascens C. & P. 

 has the spots plane, . mostly purple and occupied by a few distinct 

 small sori, with the spores a little smaller. It inhabits Aster 

 aGumi7iatus . Adirondack Mts. 



24. P. Gerardii Ph. GerarcPs Brand. 



Spots as ^ in the preceding specie^3 ; sori clustered, compactly 

 crowded together or, confluent, tawny or cinnamon-brown ; spores 

 and peduncle as in the preceding, but paler in color. 



Leaves of asters and goldenrods, especially of Aster simjjlex. 



This species is'perhaps ' too ! near the preceding, from which it 

 may, however, be distinguished atf'a glance by the diflerent color of 

 the sori and their densely confluent or matted mode of growth, 

 which frequently causes the whole cluster to appear like one very 

 large sorus. Sometimes the sori occur quite abundantly on the 

 upper surface of the leaf. 



25. P. CiRO^^E Pers. 



Hypogenous ; spots pallid or brownish ; sori clustered, small, 

 often confluent, brown ortawny ; spores oblong, generally obtusely 

 r pointed, .001-.0013' long, .0005' brt>ad ; peduncle mostly thick, 

 about as long as the spore. 



Leaves of Gircma Lutetiana and G. alpina. Common. July 

 to September. 



In all our specimens on G. Jyutetiana the sori have a dense 

 matted appeamnce, but in all on G. alpina they are smaller and 

 distinct, sometimes beautifully circinating and a little darker 

 colored. 



26. P. soLiDA Schw. Gompact Brand. 



Hypogenous ; spots unequal, brown or purplish, often concave 

 above and convex below; sori clustered or scattered, compact, 

 sometimes densely matted together, blackish brown or black; 

 spores oblong-clavate, narrow, constricted, .0016'-.0022' long, 

 .0005' broad ; peduncle very short. 



