138 



Mycologia 



Type locality : Bethlehem, Pennsylvania, on Cy perns sp. 



Distribution : New York to Michigan and Nebraska south 

 through Mexico, Central America and the West Indies. 



Exsiccati: Barth. Fungi Columb. 244g, 2y^8, 4260; Barth. N. 

 Am. Ured. 136, 137, 233, 337, 839, 1038, 1430, 1637; Carleton, 

 Ured. Am. 10; Ellis, N. Fungi ioi8h; ElHs & Ev. Fungi Columb. 

 55^. 9S3, 1760, 2144, 2146; Ellis & Ev. N. Am. Fungi 3143, 3332; 

 Seym. & Earle, Econ. Fungi jpj. 



A comparison of the types of Pitccinia canaliciilata Schw. and 

 P. Cyperi Arth. shows clearly that they are distinct species. The 

 presence of a strongly developed stroma in the telia of P. cana- 

 liciilata and a lack of a similar development in P. Cyperi is one of 

 the most conspicuous differences. There are also other distin- 

 guishing characters in the telia. In P. canaliculata the telia are 

 not much raised above the surface and the epidermis does not 

 rupture noticeably whereas in the other species the telia are pul- 

 vinate and the ruptured epidermis becomes conspicuous. Impor- 

 tant differences in the urediniospores particularly in size of the 

 spores and arrangement of pores help to make the separation of 

 the two species unquestionable. This is the only Cyperus rust 

 which has been cultured. For record of first cultures see Journal 

 of Mycology 12 : 23. 1906. 



2. Puccinia Cyperi-tagetiformis (P. Henn.) comb. nov. 



Uredo Cyperi-tagetiformis P. Henn. Engler's Bot. Jahrb. 34: 

 598. 1905. 

 O and I. Pycnia and aecia unknown. 



II. Uredinia hypophyllous and culmicolous, scattered, oblong, 

 0.5-2 mm. long, tardily dehiscent by longitudinal slits, buUate, 

 finely pulverulent, cinnamon-brown ; urediniospores broadly el- 

 lipsoid or slightly obovoid, 15-21 by 19-26 the wall dark 

 cinnamon-brown or somewhat lighter, 1.5-2.5 /x thick, frequently 

 thicker and lighter at apex, up to 3 /x, verrucose or verrucose- 

 echinulate, the markings more pronounced above, the pores 2, 

 equatorial. 



In. Telia chiefly hypophyllous, most often confluent in groups 

 1-4 mm. or more long, individual sori linear, about o.i mm. in 

 width, surrounded by well developed brownish stroma, blackish- 

 brown, long covered by the epidermis, not much raised above the 



